File Polished Diabase.jpg thumb DiabaseDiabase IPAc en d a . b e s or dolerite is a mafic , holocrystalline ... usage, the term diabase refers to the fresh rock, whilst elsewhere the term dolerite is used for the fresh rock and diabase refers to altered material. ref Arthur Holmes Holmes, Arthur , 1974, Principles of Physical Geology , Halsted Press, 3rd ed., p. 70 ISBN 0 471 07251 6 ref ref 1911 ref Diabase ... Diabase normally has a fine, but visible texture of euhedral lath shaped plagioclase crystal s 62 ... to 12 in olivine diabase , magnetite 2 , and ilmenite 2 . ref Klein, Cornelus and Cornelius S. Hurlbut ... commonly labradorite . Diabase dolerite File The Totem Pole, Cape Huay.jpg thumb left The Candlestick ... of diabase . Dolerite lang el doleros , meaning deceptive was the name given by Ren Just Ha y Ha y in his 1822 Trait de min ralogie . In continental Europe diabase was reserved by Alexandre Brongniart .... The use of diabase in this sense was abandoned in Britain in favor of dolerite for rocks of all ... to use diabase to describe slightly altered dolerite, in which pyroxene has been altered to amphibole .... ISBN 0140510494 ref Locations File Dike diabase AZ.jpg thumb A diabase dike geology dike crosscutting horizontal limestone beds in Arizona Diabase is usually found in smaller relatively shallow intrusive bodies such as dike geology dikes and sill geology sill s. Diabase dikes occur in regions ... River , near New York City , is an example of a diabase sill. The dike complexes of the British ... Gullion region of Ireland , and extends across northern England contains many examples of diabase ... land in the Southern Hemisphere include many large diabase dolerite sills and dike swarms ... magma, the ring dikes forming in the fracture zone around the sunken block. Use Diabase ... also List of rock types References reflist 30em External links Commons category Diabase http maps.google.com ... io Diabaso it Diabase ka mk nl Doleriet ja no Diabas pl Diabaz pt Di base ru ... more details
Geobox Range Heading name Diabase Hills native name other name category Mountain Range Names etymology Image image image caption Country country United States state Nevada region district Washoe County, Nevada Washoe County municipality topo map Wadsworth topo maker USGS Family range border part city landmark river Locations lat d 39 lat m 44 lat s 23.679 lat NS N long d 119 long m 17 long s 31.616 long EW W highest highest location highest region highest country highest elevation 1579 highest lat d highest lat m highest lat s highest lat NS highest long d highest long m highest long s highest long EW lowest lowest location lowest region lowest country lowest elevation imperial lowest lat d lowest lat m lowest lat s lowest lat NS lowest long d lowest long m lowest long s lowest long EW Dimensions length imperial length orientation width imperial width orientation height imperial area imperial Features timezone Pacific Standard Time Pacific utc offset 8 timezone DST Pacific Daylight Time PDT utc offset DST 7 geology orogeny period biome plant animal Free fields free free type Maps map Nevada Locator Map.PNG map caption location of Diabase Hills in Nevada ref name gnis cite gnis id 848458 name Diabase Hills accessdate 2009 05 04 ref map background map locator Nevada Website website Footnotes footnotes The Diabase Hills are a mountain range in Washoe County, Nevada Washoe County , Nevada . ref name gnis References reflist Category Mountain ranges of Nevada Category Mountain ranges of the Great Basin Category Landforms of Washoe County, Nevada Nevada geo stub ... more details
Orphan date February 2009 The Shelburne dike is a large northeast trending Mesozoic diabase dike geology dike in southeastern Nova Scotia , Canada . It is convert 140 km mi 0 abbr on long, although some evidence suggests it extends a further convert 60 km mi 0 abbr on to the northeast to Sambro Island . ref http article.pubs.nrc cnrc.gc.ca ppv RPViewDoc?issn 1480 3313&volume 19&issue 8&startPage 1707 The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia mineralogy, chemistry, and regional significance sup 1 sup Discussion ref See also Portal Volcanism of Canada Volcanism of Canada Volcanism of Eastern Canada References reflist NovaScotia geo stub coord missing Nova Scotia Category Igneous rocks Category Volcanism of Nova Scotia Category Mesozoic volcanism ... more details
Governor Stable is a notable geologic formation in northern Lancaster County, Pennsylvania . Scattered along the northern bank of a small drainage are a high number of large diabase boulders. Governor Stable is privately owned. Friends of Governor Stable administers a recreational lease on the property, allowing organization members access to the property for bouldering . ref cite web title About Us url http friendsofgs.org about work FoGS accessdate 24 December 2011 ref References Reflist External links http friendsofgs.org Friends of Governor Stable coord 40.130787 76.693582 type landmark globe earth region US PA display title Category Geology of Pennsylvania Category Geography of Lancaster County, Pennsylvania Category Climbing areas of the United States US geology stub ... more details
Orphan date February 2009 Leelinger Island is a flat diabase dolerite island with an area of 1.54 hectare ha in south eastern Australia . It is part of the Hibbs Pyramid Group, lying close to the central western coast of Tasmania . ref name Brothers2001 Brothers, Nigel Pemberton, David Pryor, Helen & Halley, Vanessa. 2001 . Tasmania s Offshore Islands seabirds and other natural features . Tasmanian Museum and Art Gallery Hobart. ISBN 0 7246 4816 X ref Fauna Recorded breeding seabird and wader species are the Little Penguin 400 pairs , Short tailed Shearwater 6000 pairs , Pacific Gull and Sooty Oystercatcher . ref name Brothers2001 References reflist coord 42 38 S 145 17 E display title Category Islands of Tasmania Tasmania geo stub ... more details
A subvolcanic rock , also known as a hypabyssal rock , is an igneous rock that originates at medium to shallow depths within the Crust geology crust , and has intermediate Crystallite grain size and often porphyritic texture. They have textures between volcanic rock volcanic and plutonic rock s. Subvolcanic rocks include diabase also known as Dolerite and porphyry geology porphyry . See also Volcanic rock Intrusion References http australianmuseum.net.au Igneous rock types Igneous rock types Australian Museum Igneous rocks Category Igneous petrology Category Volcanology Category Subvolcanic rocks Volcanology stub es Roca filoniana fr Roche filonienne it Rocce filoniane he ml ja pt Rocha subvulc nica fi Puolipinnallinen kivi ... more details
are diabase . In 1965, geologist Richard Faas of Lafayette College took a few of the rocks back to his ... ringrock.htm title Ringing Rock format Web accessdate 2010 08 16 publisher Unmuseum ref Diabase ... fields fall into a specific category of being composed of olivine diabase. The boulder fields formed from a group of diabase sills located in the geologic Newark Basin. The sills were formed when mafic ... Period . When the diabase sills were still molten crystals of olivine and pyroxene settled to the bottom .... During the Pleistocene outcrops of the olivine diabase were not buried by the glacial sheets, however ... the outcrops to be broken into extensive boulder fields. Location of the Diabase Ringing Rock Boulder Fields Although there have been over a dozen diabase ringing rock boulder fields identified ... Rock Diabase Locations.jpg Location of Diabase Ringing Rock Boulder Fields gallery Geology of the Boulder ... diabase. Approximately 200 million years ago stretching of the Earth s crust allowed basaltic magma ... diabase unit is significantly harder, denser, and more resistant to weathering than the upper portions of the diabase sill. Most observers did not make the distinction between the upper normal diabase which is found over wide areas, and the thin olivine diabase unit found at the base of the sills which ... appearance of the rocks. Both the normal and olivine diabase rocks are dark grey to black in color ... to identify the differences. Although the Newark series diabase sills crop out in a belt throughout ... and the boulders break down due to weathering. Because the olivine diabase unit is relatively thin ... diabase unit had to be dipping in the same direction as the slope of the ground surface. This specific dip slope situation allowed broad expanses of olivine diabase to be exposed and provided enough ... where the olivine diabase unit dipped at right angles into a shallow drainage. Where the olivine diabase does not dip in the same direction as the ground surface there is generally numerous ... more details
image North america basement rocks.png right thumb 250px North America cratons and basement rock. The Rae craton is an Archean craton located in northern Canada north of the Superior craton . Ungava Peninsula The Ungava Peninsula , situated on the northeast portion of the Canadian Shield , is where the Rae Province connects with the Superior Province. The area is composed of Archean rocks ca. 2.7 2.9 Ga from the Douglas Harbour Domain see Superior craton . The Rae Craton Archean rocks are overlain by Paleoproterozoic supracrustal Sequence geology sequences ca. 1.8 2.1 Ga and intrusion intruded by Paleoproterozoic diabase Dike geology dykes ca.2.0 2.2 Ga . The supracrustal rocks comprise nappe s that form part of the Ungava and Labrador Trough geology troughs . In the zone east of the Labrador Trough axis, the Paleoproterozoic deformation reworked the Archean rocks of the Douglas Harbour Domain, as well as the Paleoproterozoic diabase dykes. The metamorphic conditions which parallel the deformation increase from west to east and from middle amphibolite to granulite facies . uranium lead dating U Pb isotope analyses of zircon yield secondary ages around 1790 Ma. These results are interpreted as the age of metamorphism and indicate a reactivation of the northeastern margin of the Superior craton Superior Province during a Paleoproterozoic tectonic tectono Metamorphism metamorphic event, resulting from probable continent al collision. Madore, 2001 . See also Canadian Shield North American craton References Madore, L., and Y. Larbi. 2001 Regional structural character of the northeastern Ungava Peninsula Connection between the Rae and Superior provinces. St. John s 2001 Technical Programme SS2 Tectonic Integration of Circum Superior Orogens. Online Abstract http gac.esd.mun.ca gac 2001 seven sub program.asp?sess 98&form 10&abs no 118 Category Cratons Category Historical geology Category Geology of the Northwest Territories Category Geology of North America palaeo geo stub ... more details
Elklick Woodlands Natural Area Preserve is a Virginia Natural Area Preserve System Natural Area Preserve located in Fairfax County, Virginia . Owned by the Fairfax County Park Authority , it is protected with a local conservation easement , and preserves a rare habitat known as a northern hardpan basic oak hickory forest . This kind of forest occurs on diabase soil with an underlay of dense plastic clay such terrain is commonly called shrink swell soil . Trees which grow in such an environemtn are stunted, but a wide variety of grasses and herbs may be found in the understory. Such forests were once common around northern Virginia , but with the increasing suburb anization of the area are being lost. References http www.dcr.virginia.gov natural heritage natural area preserves elklick.shtml Preserve webpage Protected Areas of Virginia coord missing Virginia Category Virginia Natural Area Preserves Category Protected areas of Fairfax County, Virginia Virginia protected area stub FairfaxVA geo stub ... more details
Orphan date February 2009 Wedge Island is an island, with an area of 43 hectare ha , in south eastern Australia . It is part of the Tasman Island Group, lying close to the south eastern coast of Tasmania around the Tasman Peninsula . It is formed of Jurassic diabase dolerite . ref name Brothers2001 Brothers, Nigel Pemberton, David Pryor, Helen & Halley, Vanessa. 2001 . Tasmania s Offshore Islands seabirds and other natural features . Tasmanian Museum and Art Gallery Hobart. ISBN 0 7246 4816 X ref Fauna Recorded breeding seabird species are Little Penguin and Short tailed Shearwater . The island was previously used for domestic sheep sheep grazing , and was regularly burnt. The sheep were removed in 1986. There were also large numbers of European Rabbit s, now exterminated. Cat s were introduced in the 1970s to control the rabbits, and a population of feral cat s remains on the island. ref name Brothers2001 References reflist coord 43 08 S 147 40 E display title Category Islands of Tasmania Tasmania geo stub ... more details
Orphan date February 2009 Montgomery Rocks comprises a pair of rocky diabase dolerite and limestone islet s, with a combined area of 3.69 hectare ha and a high point of 50 m, in south eastern Australia . They are part of the Hibbs Pyramid Group, lying close to the central western coast of Tasmania . ref name Brothers2001 Brothers, Nigel Pemberton, David Pryor, Helen & Halley, Vanessa. 2001 . Tasmania s Offshore Islands seabirds and other natural features . Tasmanian Museum and Art Gallery Hobart. ISBN 0 7246 4816 X ref Fauna Recorded breeding seabird and wader species are the Little Penguin 60 pairs , Short tailed Shearwater 560 pairs , Fairy Prion 760 pairs , Common Diving Petrel 100 pairs , Pacific Gull and Sooty Oystercatcher . The Metallic Skink is present. ref name Brothers2001 References reflist coord 42 46 S 145 22 E display title Category Islands of Tasmania Tasmania geo stub ... more details
, Pennsylvania ref Haycock is covered with numerous triassic diabase boulders, and is a bouldering ... cooled it became a large mass of erosion resistant diabase below the surface. Millions of years of weathering then stripped away overlying layers of shale and argillite to expose the durable diabase ... Online ref In addition to diabase, Haycock Mountain features a large area underlain by hornfels ... more details
Elliot Lake area the Nipissing diabase is deformed outcrops are parallel to the fold axes of the Huronian sedimentary rocks. ref name palmer Nipissing diabase intrusions are east northeast trending ... more details
H lleflinta a Swedish language Swedish word meaning rock flint , a white, grey, yellow, greenish or pink, fine grained rock consisting of an intimate mixture of quartz and feldspar . Many examples are banded or striated others contain porphyritic crystals of quartz which resemble those of the felsites and porphyries. Mica , iron oxide s, apatite , zircon , epidote and hornblende may also be present in small amount. The more micaceous varieties form transitions to granulite and gneiss . H lleflinta under the microscope is very finely crystalline , or even cryptocrystalline , resembling the felsitic matrix of many acid rocks. It is essentially metamorphic and occurs with gneisses, schists and granulites, especially in the Scandinavia n peninsula, where it is regarded as being very characteristic of certain horizons. Of its original nature there is some doubt, but its chemical composition and the occasional presence of porphyritic crystals indicate that it has affinities to the fine grained acid intrusive rocks. In this group there may also have been placed metamorphosed acid tuffs and a certain number of adinoles shales, contact altered by intrusions of diabase . The assemblage is not a perfectly homogeneous one but includes both igneous and sedimentary rocks, but the former preponderate. Rocks very similar to the typical Swedish h lleflintas occur in German Tyrol Tirol , in Galicia Central Europe Galicia and eastern Bohemia . Category Metamorphic rocks 1911 nn Helleflint sv H lleflinta ... more details
The British Tertiary Volcanic Province was created 60 50 million years ago during the formation of the North Atlantic . ref Emeleus, C. H. & Gyopari, M. C., 1992 , British Tertiary Volcanic Province, GCR Volume No. 4 ref As the Earth s crust stretched, volcano es and lava flows erupted along a line from Ireland to the Hebrides . The Giant s Causeway and Staffa are the most famous natural monuments created by this event. Other sites include Skye , Isle of Mull Mull , Ardnamurchan , Isle of Arran Arran , Sanday, Inner Hebrides Sanday , Eigg , Canna, Scotland Canna , Rathlin Island and Lundy . The Dike geology dike complexes of the province contain many examples of diabase dolerite dike swarm s. References Reflist coord 56 26 N 6 20 W region GB display title Category Volcanology Category Volcanism of Europe Category Volcanism of Northern Ireland Category Volcanism of Scotland Category Volcanic groups Category Dike swarms Category Paleocene volcanism Category Eocene volcanism Category Extinct volcanism volcanology stub NorthernIreland geo stub Scotland geo stub ... more details
Big Green Island is an island with an area of 122 hectare ha , in south eastern Australia . It is part of Tasmania s Big Green Island Group, lying in eastern Bass Strait west of Flinders Island Flinders in the Furneaux Group . It is composed of granite with limestone and diabase dolerite outcrops. It is partly a nature reserve with the rest being used for farming. ref name Brothers2001 Brothers, Nigel Pemberton, David Pryor, Helen & Halley, Vanessa. 2001 . Tasmania s Offshore Islands seabirds and other natural features . Tasmanian Museum and Art Gallery Hobart. ISBN 0 7246 4816 X ref The island is also part of the Chalky, Big Green and Badger Island Groups Important Bird Area . ref cite web url http www.birdata.com.au iba.vm title IBA Chalky, Big Green and Badger Island Groups accessdate 2011 06 14 work Birdata first last publisher Birds Australia date ref Fauna Recorded breeding seabird and wader species are Little Penguin , Short tailed Shearwater , Pacific Gull , Silver Gull , Sooty Oystercatcher , Pied Oystercatcher , Black faced Cormorant and Caspian Tern . Cape Barren Goose Cape Barren Geese also breed on the island. Reptile s present include the Metallic Skink and Bougainville s Skink . Rat s are common. ref name Brothers2001 References reflist coord 40 11 S 147 58 E display title Category Furneaux Group Category Important Bird Areas of Tasmania Tasmania geo stub ... more details
Orphan date February 2009 Courts Island is a diabase dolerite island with an area of 15.83 hectare ha in south eastern Australia . It is part of the Actaeon Island Group, lying close to the south eastern coast of Tasmania , at the southern entrance to the D Entrecasteaux Channel between Bruny Island and the mainland. It is connected to Bruny Island by a spit landform spit at low tide, and is part of South Bruny National Park . ref name Brothers2001 Brothers, Nigel Pemberton, David Pryor, Helen & Halley, Vanessa. 2001 . Tasmania s Offshore Islands seabirds and other natural features . Tasmanian Museum and Art Gallery Hobart. ISBN 0 7246 4816 X ref ref name consmgt citation title Small Southern Islands Conservation Management Statement 2002 url http www.parks.tas.gov.au IslandCare southern islands.pdf year 2002 publisher Tasmania Parks and Wildlife Service accessdate 2006 07 20 archiveurl http web.archive.org web 20060822190600 http www.parks.tas.gov.au IslandCare southern islands.pdf archivedate 2006 08 22 ref Fauna Recorded breeding seabird species are the Little Penguin , Short tailed Shearwater and Sooty Shearwater . Feral cat s are present. ref name Brothers2001 References reflist coord 43 29 S 147 08 E display title Category Islands of Tasmania Category Protected areas of Tasmania Tasmania geo stub ... more details
Orphan date February 2009 Blanche Rock is a 0.07 hectare ha diabase dolerite islet in south eastern Australia . It is part of the Actaeon Island Group, lying close to the south eastern coast of Tasmania , at the southern entrance to the D Entrecasteaux Channel between Bruny Island and the mainland. It is part of the South Bruny National Park . ref name Brothers2001 Brothers, Nigel Pemberton, David Pryor, Helen & Halley, Vanessa. 2001 . Tasmania s Offshore Islands seabirds and other natural features . Tasmanian Museum and Art Gallery Hobart. ISBN 0 7246 4816 X ref ref name consmgt citation title Small Southern Islands Conservation Management Statement 2002 url http www.parks.tas.gov.au IslandCare southern islands.pdf year 2002 publisher Tasmania Parks and Wildlife Service accessdate 2006 07 20 archiveurl http web.archive.org web 20060822190600 http www.parks.tas.gov.au IslandCare southern islands.pdf archivedate 2006 08 22 ref Fauna Recorded breeding seabird and wader species are the Pacific Gull , Sooty Oystercatcher and Black faced Cormorant . ref name Brothers2001 References reflist coord 43 29 S 147 00 E display title Category Islands of Tasmania Category Protected areas of Tasmania Tasmania geo stub ... more details
Actaeon Island is a 15.65 hectare ha diabase dolerite island game reserve in south eastern Australia . It is part of the Actaeon Island Group, lying close to the south eastern coast of Tasmania , at the southern entrance to the D Entrecasteaux Channel between Bruny Island and the mainland. There is a navigation beacon on the highest point, 14 m above mean sea level asl . ref name Brothers2001 Brothers, Nigel Pemberton, David Pryor, Helen & Halley, Vanessa. 2001 . Tasmania s Offshore Islands seabirds and other natural features . Tasmanian Museum and Art Gallery Hobart. ISBN 0 7246 4816 X ref ref name consmgt citation title Small Southern Islands Conservation Management Statement 2002 url http www.parks.tas.gov.au IslandCare southern islands.pdf year 2002 publisher Tasmania Parks and Wildlife Service accessdate 2006 07 20 archiveurl http web.archive.org web 20060822190600 http www.parks.tas.gov.au IslandCare southern islands.pdf archivedate 2006 08 22 ref Fauna Recorded breeding seabird and wader species are the Little Penguin , Short tailed Shearwater and Sooty Oystercatcher . European Rabbit s occur on the island and Pinniped seals occasionally hauling out haul out there. The Metallic Skink is present. ref name Brothers2001 References reflist coord 43 31 S 146 59 E display title Category Islands of Tasmania Tasmania geo stub ... more details
Hibbs Pyramid is a pyramid pyramidal diabase dolerite island with an area of 4.65 hectare ha in south eastern Australia, on the West Coast Tasmania West Coast of Tasmania in Hibbs Bay adjacent to Point Hibbs . It is part of the Hibbs Pyramid Group, lying close to the central western coast of Tasmania . ref name Brothers2001 Brothers, Nigel Pemberton, David Pryor, Helen & Halley, Vanessa. 2001 . Tasmania s Offshore Islands seabirds and other natural features . Tasmanian Museum and Art Gallery Hobart. ISBN 0 7246 4816 X ref In early stages of the exploration of the region, the Pyramid Rock was considered a good sheltering location for coastal shipping offloading materials ref cite news url http nla.gov.au nla.news article10358872 title STATE MINING ENGINEER. newspaper The Mercury 28Hobart 29 The Mercury Hobart, Tas. 1860 1954 location Hobart, Tas. date 14 January 1914 accessdate 11 July 2011 page 2 publisher National Library of Australia ref Fauna Recorded breeding seabird and wader species are the Little Penguin 820 pairs , Short tailed Shearwater 9000 pairs and Sooty Oystercatcher . Fur seal s hauling out haul out on an adjacent rock. Reptile s present include the Metallic Skink and Tasmanian Tree Skink . ref name Brothers2001 References reflist coord 42 36 16 S 145 16 36 E type isle region AU display title Category Islands of Tasmania Category South West Tasmania Tasmania geo stub ... more details
File Steinerne Rose.jpg thumb 250px The Steinerne Rose The Steinerne Rose is a natural monument , unique in Europe. It is a diabase rock formation, that was formed in the middle Devonian , i.e. about 400 million years ago, as a dyke geology dyke . The rock has been weathered over the centuries into concentric layers exfoliation joint s which give it the appearance of a rosebud in bloom. The Steinerne Rose is located at about 700 metres, north of Kloster, a village in the borough of Saalburg Ebersdorf in the district of Saale Orla Kreis in the central German state of Thuringia , on the local road known as the Reu ische F rstenstra e L 1095 , immediately on the right in front of the bridge over the old Schleiz Light Railway Schleiz Saalburg railway . There are several smaller stone roses on the Schlossfelsen rocks in Ronneburg Thuringia Ronneburg . File Stamps of Germany DDR 1977, MiNr 2206.jpg thumb 180px The Steinerne Rose as a stamp motif External links http www.saalburg ebersdorf.de phpwcms index.php?id 40,28,0,0,1,0 Website for Saalburg Ebersdorf de icon http www.geoakademie.de AGH1 of Dateien Geotope Saalburg.htm Hanover Academy of Earth Sciences de icon Coord 50 31 15 N 11 44 5 E type landmark region DE TH display title Thuringia geo stub Category Natural monuments in Thuringia Category Rock formations in Thuringia de Steinerne Rose he ... more details
as basalt , if extrusive , or diabase , if intrusive . East Rock, being intrusive, is diabase. Diabase is a dark colored rock, but the iron within it weathers to a rusty brown when exposed to the air, lending the ledges a distinct reddish appearance. Diabase frequently breaks into octagonal and pentagonal columns, creating a unique postpile appearance. Huge slopes made of fractured diabase scree are visible beneath many of the ledges of East Rock. These diabase cliffs are the product of lava ... the sill had intruded, at a faster rate than the diabase, leaving the abruptly tilted edges of the diabase ... more details
The Sibley Peninsula is a convert 52 km mi 0 long and convert 10 km mi 0 wide peninsula in Ontario , Canada on Lake Superior . It projects into the lake from North Shore Lake Superior Superior s north shore , and separates Thunder Bay Ontario landform Thunder Bay to the west from Black Bay to the east. ref name Background Sleeping Giant Background Information , 3.2 Earth Science, Topography, pp. 11. ref Sleeping Giant Provincial Park occupies most of the peninsula. The Sleeping Giant Ontario Sleeping Giant is a large rock formation along the peninsula which resembles a human figure lying on its back. Also on the peninsula are the Thunder Cape Bird Observatory, at its southern tip, and the small town of Silver Islet, Ontario Silver Islet . Highway 587 Ontario Highway 587 runs along the peninsula from Highway 17 Ontario Highway 17 to Silver Islet. The peninsula was named after Alexander H. Sibley , president of the Silver Islet Mining Company that developed a mine there. Geology The peninsula can be separated into two physiographic areas&mdash Highland geography highlands and lowland s. The highlands dominate the western half of the peninsula, and rise to convert 380 m ft 0 above the surface of Lake Superior. The lowlands of the eastern portion of the peninsula rise to only convert 75 m ft 0 , over an area 3 to 6 kilometres 2 to 4 mi wide. With the exception of diabase Dike geology dikes and the large diabase Sill geology sill that forms the upper portion of the Sleeping Giant, the peninsula is underlain by sedimentary rocks , which strike northeast and slope towards the southwest, forming a cuesta . ref name Background History Sibley Peninsula has archaeological sites from Paleo Indians Paleoindian , Archaic period in the Americas arachaic , and Woodland period woodland settlements. ref name Turk Citation last Turk first Linda title What s in a Name? Some Believe a New Designation Can Protect the North Shore journal Lake Superior Magazine volume 22 issue 3 pages ... more details
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