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Mineral Resources > Online Spatial Data > Geology > by state > Maine Geology

Geologic units in Aroostook county, Maine

Silurian Burnt Brook Formation (Silurian) at surface, covers 0.2 % of this area
Silurian Burnt Brook Formation
Lithology: mudstone
Ordovician quartz diorite (hornblende accessory mineral) (Ordovician) at surface, covers 0.2 % of this area
Ordovician quartz diorite (hornblende accessory mineral)
Lithology: quartz diorite
Silurian Smyrna Mills Formation (Silurian) at surface, covers 3 % of this area
Silurian Smyrna Mills Formation
Lithology: slate; siltstone; quartztite; graywacke
Ordovician Winterville Formation (Ordovician) at surface, covers 4 % of this area
Ordovician Winterville Formation
Lithology: basalt
Devonian Hedgehog Formation (Devonian) at surface, covers 0.4 % of this area
Devonian Hedgehog Formation
Lithology: mafic volcanic rock; felsic volcanic rock
Ordovician - Cambrian Saint Daniel formation (Ordovician - Cambrian) at surface, covers 3 % of this area
Ordovician - Cambrian Saint Daniel formation
Lithology: melange
Silurian Rocky Mountain Quartz Latite (Silurian) at surface, covers < 0.1 % of this area
Silurian Rocky Mountain Quartz Latite
Lithology: quartz latite
Silurian undifferentiated sandstones (Silurian) at surface, covers < 0.1 % of this area
Silurian undifferentiated sandstones, in part of the Allsbury Formation and in part unnamed
Lithology: sandstone
Ordovician Pile Mountain Argillite (Ordovician) at surface, covers < 0.1 % of this area
Ordovician Pile Mountain Argillite
Lithology: argillite
Ordovician Chandler Ridge Formation (Ordovician) at surface, covers 0.2 % of this area
Ordovician Chandler Ridge Formation
Lithology: graywacke; slate; siltstone; quartzite
Devonian Mapleton Formation (Devonian) at surface, covers 0.1 % of this area
Devonian Mapleton Formation
Lithology: sandstone; conglomerate
Ordovician - Cambrian Chase Brook Formation (Ordovician - Cambrian) at surface, covers 0.5 % of this area
Ordovician - Cambrian Chase Brook Formation
Lithology: slate; limestone; siltstone
Devonian - Silurian Fish River Lake Formation (Devonian - Silurian) at surface, covers 0.9 % of this area
Devonian - Silurian Fish River Lake Formation
Lithology: mudstone; sandstone; limestone; dolostone (dolomite)
Silurian Spragueville Formation (Silurian) at surface, covers 1 % of this area
Silurian Spragueville Formation
Lithology: mudstone; limestone; dolostone (dolomite)
Silurian - Ordovician Carys Mills Formation pelite member (Silurian - Ordovician) at surface, covers 0.2 % of this area
Silurian - Ordovician Carys Mills Formation pelite member
Lithology: mudstone
Devonian - Silurian Fogelin Hill Formation (Devonian - Silurian) at surface, covers 0.7 % of this area
Devonian - Silurian Fogelin Hill Formation
Lithology: mudstone; sandstone
Devonian - Silurian Bell Brook Formation, pelite member (Devonian - Silurian) at surface, covers 0.7 % of this area
Devonian - Silurian Bell Brook Formation pelite member
Lithology: mudstone
Ordovician unnamed volcanic and sedimentary rocks (Ordovician) at surface, covers < 0.1 % of this area
Ordovician unnamed volcanic and sedimentary rocks
Lithology: mafic volcanic rock; felsic volcanic rock; sedimentary rock
Devonian granodiorite (hornblende accessory mineral) (Devonian) at surface, covers < 0.1 % of this area
Devonian granodiorite (hornblende accessory mineral) - hornblende-biotite granodiorite
Lithology: granodiorite
Devonian granite (Devonian) at surface, covers 0.5 % of this area
Devonian granite
Lithology: granite
Silurian - Ordovician Mars Hill Conglomerate (Silurian - Ordovician) at surface, covers < 0.1 % of this area
Silurian - Ordovician Mars Hill Conglomerate
Lithology: conglomerate
Undifferentiated volcanic rocks of the Spider Lake and Chandler Pond Formations (Devonian - Silurian) at surface, covers 0.2 % of this area
Undifferentiated volcanic rocks of the Spider Lake and Chandler Pond Formations
Lithology: andesite
Ordovician tuff of the Depot Mountain sequence (Ordovician) at surface, covers < 0.1 % of this area
Ordovician tuff of the Depot Mountain sequence
Lithology: felsic volcanic rock
Devonian - Ordovician Spruce Top Greenstone (Devonian - Ordovician) at surface, covers < 0.1 % of this area
Devonian - Ordovician Spruce Top Greenstone
Lithology: greenstone
Silurian Frenchville Formation (Silurian) at surface, covers 1 % of this area
Silurian Frenchville Formation
Lithology: sandstone; conglomerate
Devonian Chapman Sandstone (Devonian) at surface, covers 0.4 % of this area
Devonian Chapman Sandstone
Lithology: sandstone; shale
Silurian - Ordovician Mattawamkeag Formation (Silurian - Ordovician) at surface, covers 0.5 % of this area
Silurian - Ordovician Mattawamkeag Formation
Lithology: mudstone; sandstone
Silurian unnamed conglomerate (Silurian) at surface, covers 0.5 % of this area
Silurian unnamed conglomerate
Lithology: conglomerate; quartz-feldspar schist
Ordovician gabbro/diorite/ultramafic rocks (Ordovician) at surface, covers < 0.1 % of this area
Ordovician gabbro/diorite/ultramafic rocks
Lithology: gabbro; diorite; ultramafic intrusive rock
Silurian unnamed sedimentary rocks (Silurian) at surface, covers 0.2 % of this area
Silurian unnamed sedimentary rocks
Lithology: mudstone; sandstone; limestone; dolostone (dolomite)
Devonian Edmunds Hill Andesite (Devonian) at surface, covers < 0.1 % of this area
Devonian Edmunds Hill Andesite
Lithology: andesite
Silurian rocks of the Fivemile Brook sequence (Silurian) at surface, covers 0.3 % of this area
Silurian rocks of the Fivemile Brook sequence
Lithology: phyllite; limestone; basalt
Silurian undifferentiated pelites and sandstones (Silurian) at surface, covers 4 % of this area
Silurian undifferentiated pelites and sandstones, in part of the Allsbury Formation and in part unnamed
Lithology: slate; sandstone; conglomerate; graywacke
Devonian - Silurian Bell Brook Formation, conglomerate member (Devonian - Silurian) at surface, covers 0.1 % of this area
Devonian - Silurian Bell Brook Formation, conglomerate member
Lithology: conglomerate
Devonian granodiorite (hornblende accessory mineral, porphyritic texture) (Devonian) at surface, covers < 0.1 % of this area
Devonian granodiorite (hornblende accessory mineral, porphyritic texture) - porphyritic hornblende-biotite granodiorite
Lithology: granodiorite
Devonian - Silurian Daggett Ridge Formation (Devonian - Silurian) at surface, covers 0.1 % of this area
Devonian - Silurian Daggett Ridge Formation
Lithology: sandstone; conglomerate
Ordovician - Cambrian unnamed sedimentary rocks (Ordovician - Cambrian) at surface, covers 0.6 % of this area
Ordovician - Cambrian unnamed sedimentary rocks
Lithology: mudstone; sandstone
Devonian - Silurian unnamed sedimentary rocks (Devonian - Silurian) at surface, covers 2 % of this area
Devonian - Silurian unnamed sedimentary rocks
Lithology: mudstone; sandstone
Ordovician unnamed pelite (Ordovician) at surface, covers 0.1 % of this area
Ordovician unnamed pelite
Lithology: mudstone
Devonian - Silurian undifferentiated sedimentary rocks of the Spider Lake, Chandler Pond and Third Lake Formations (Devonian - Silurian) at surface, covers < 0.1 % of this area
Devonian - Silurian undifferentiated sedimentary rocks of the Spider Lake, Chandler Pond and Third Lake Formations
Lithology: sandstone; mudstone; limestone; dolostone (dolomite)
Ordovician unnamed felsic volcanic rocks (Ordovician) at surface, covers < 0.1 % of this area
Ordovician unnamed felsic volcanic rocks
Lithology: felsic volcanic rock
Devonian granite (granophyric texture) (Devonian) at surface, covers < 0.1 % of this area
Devonian granite (granophyric texture)
Lithology: granite
Silurian undifferentiated conglomerates and coarse-grained sandstones (Silurian) at surface, covers < 0.1 % of this area
Silurian undifferentiated conglomerates and coarse-grained sandstones, in part of the Allsbury Formation and in part unnamed
Lithology: conglomerate; sandstone
Silurian unnamed volcanic and sedimentary rocks (Silurian) at surface, covers < 0.1 % of this area
Silurian unnamed volcanic and sedimentary rocks
Lithology: mafic volcanic rock; felsic volcanic rock; sedimentary rock
Devonian Hartin Formation (Devonian) at surface, covers 0.1 % of this area
Devonian Hartin Formation
Lithology: sandstone
Ordovician graywacke of the Depot Mountain sequence (Ordovician) at surface, covers 0.5 % of this area
Ordovician graywacke of the Depot Mountain sequence
Lithology: graywacke
Ordovician Madawaska Lake Formation (Ordovician) at surface, covers 3 % of this area
Ordovician Madawaska Lake Formation
Lithology: mudstone; sandstone
Silurian - Ordovician Nine Lake formation (Silurian - Ordovician) at surface, covers 0.1 % of this area
Silurian - Ordovician Nine Lake formation
Lithology: mudstone; sandstone
Silurian Maple Mountain Formation (Silurian) at surface, covers 0.2 % of this area
Silurian Maple Mountain Formation
Lithology: mudstone; sandstone
Ordovician Shin Brook Formation (Ordovician) at surface, covers < 0.1 % of this area
Ordovician Shin Brook Formation
Lithology: rhyolite; siltstone; conglomerate; breccia
Silurian Jemtland Formation (Silurian) at surface, covers 1 % of this area
Silurian Jemtland Formation
Lithology: mudstone; sandstone
Silurian - Precambrian Z ultramafic rocks (Silurian - Precambrian Z) at surface, covers < 0.1 % of this area
Silurian - Precambrian Z ultramafic rocks
Lithology: ultramafic intrusive rock
Devonian unnamed sedimentary rocks (Devonian) at surface, covers 0.5 % of this area
Devonian unnamed sedimentary rocks
Lithology: mudstone; sandstone
Ordovician granodiorite (Ordovician) at surface, covers < 0.1 % of this area
Ordovician granodiorite - Ordovician biotite granodiorite
Lithology: granodiorite
Devonian Swanback Formation (Devonian) at surface, covers 2 % of this area
Devonian Swanback Formation
Lithology: mudstone
Cambrian Jim Pond Formation mafic volcanic rocks (Cambrian) at surface, covers < 0.1 % of this area
Cambrian Jim Pond Formation mafic volcanic rocks
Lithology: greenstone
Silurian - Ordovician Carys Mills Formation lower member (Silurian - Ordovician) at surface, covers 0.3 % of this area
Silurian - Ordovician Carys Mills Formation lower member
Lithology: slate; graywacke
Ordovician unnamed volcanic rocks (Ordovician) at surface, covers 0.6 % of this area
Ordovician unnamed volcanic rocks
Lithology: mafic volcanic rock; felsic volcanic rock
Devonian - Silurian Madrid Formation (Devonian - Silurian) at surface, covers 6 % of this area
Devonian - Silurian Madrid Formation
Lithology: quartzite; calc-silicate rock
Ordovician unnamed sandstone and pelite (Ordovician) at surface, covers < 0.1 % of this area
Ordovician unnamed sandstone and pelite
Lithology: mudstone; sandstone
Ordovician Munsungun Lake Formation (Ordovician) at surface, covers 0.6 % of this area
Ordovician Munsungun Lake Formation
Lithology: felsic volcanic rock; sandstone; shale; chert; basalt
Silurian greenstone rocks of the Fivemile Brook sequence (Silurian) at surface, covers < 0.1 % of this area
Silurian greenstone rocks of the Fivemile Brook sequence
Lithology: greenstone
Devonian Seboomook Formation unnamed quartzite (Devonian) at surface, covers < 0.1 % of this area
Devonian Seboomook Formation unnamed quartzite
Lithology: quartzite
Devonian granite (hornblende accessory mineral) (Devonian) at surface, covers 0.5 % of this area
Devonian granite (hornblende accessory mineral) - hornblende-biotite granite undivided
Lithology: granite
Ordovician - Cambrian Saint Daniel formation quartzite and red and green shale (Ordovician - Cambrian) at surface, covers 0.1 % of this area
Ordovician - Cambrian Saint Daniel formation quartzite and red and green shale
Lithology: sandstone; shale
Ordovician unnamed mafic volcanic rocks (Ordovician) at surface, covers < 0.1 % of this area
Ordovician unnamed mafic volcanic rocks
Lithology: mafic volcanic rock
Silurian New Sweden Formation (Silurian) at surface, covers 2 % of this area
Silurian New Sweden Formation
Lithology: mudstone
Devonian syenite (pyroxene plus hornblende accessory mineral) (Devonian) at surface, covers < 0.1 % of this area
Devonian syenite (pyroxene plus hornblende accessory mineral) - Devonian pyroxene-hornblende-biotite syenite undivided
Lithology: syenite
Devonian unnamed conglomerate (Devonian) at surface, covers < 0.1 % of this area
Devonian unnamed conglomerate
Lithology: conglomerate
Silurian - Ordovician Dunn Brook formation (Silurian - Ordovician) at surface, covers 0.6 % of this area
Silurian - Ordovician Dunn Brook formation
Lithology: mafic volcanic rock; felsic volcanic rock
Ordovician Chase lake formation (Ordovician) at surface, covers < 0.1 % of this area
Ordovician Chase lake formation
Lithology: graywacke; conglomerate; slate
Silurian unnamed sandstone (Silurian) at surface, covers 0.4 % of this area
Silurian unnamed sandstone
Lithology: sandstone
Silurian - Ordovician Carys Mills Formation (Silurian - Ordovician) at surface, covers 9 % of this area
Silurian - Ordovician Carys Mills Formation
Lithology: limestone; siltstone; slate; graywacke
Silurian - Ordovician Aroostook River Formation (Silurian - Ordovician) at surface, covers < 0.1 % of this area
Silurian - Ordovician Aroostook River Formation
Lithology: slate; graywacke; siltstone
Devonian Seboomook Formation unnamed pelite (Devonian) at surface, covers 2 % of this area
Devonian Seboomook Formation unnamed pelite
Lithology: mudstone
Devonian syenite, monzodiorite (porphyritic texture) (Devonian) at surface, covers < 0.1 % of this area
Devonian syenite, monzodiorite (porphyritic texture) - Devonian pyroxene-hornblende-biotite syenite and monzodiorite
Lithology: syenite; monzodiorite
Cambrian Grand Pitch Formation (Cambrian) at surface, covers 1 % of this area
Cambrian Grand Pitch Formation
Lithology: mudstone; sandstone
Silurian unnamed limestone (Silurian) at surface, covers 0.4 % of this area
Silurian unnamed limestone
Lithology: limestone; dolostone (dolomite)
Devonian unnamed pelite (Devonian) at surface, covers 0.4 % of this area
Devonian unnamed pelite
Lithology: mudstone
Devonian granite (muscovite accessory mineral) (Devonian) at surface, covers < 0.1 % of this area
Devonian granite (muscovite accessory mineral) - muscovite-biotite granite undivided
Lithology: granite
Devonian Seboomook Formation (Devonian) at surface, covers 39 % of this area
Devonian Seboomook Formation
Lithology: mudstone; sandstone
Silurian - Ordovician unnamed pelite (Silurian - Ordovician) at surface, covers 0.1 % of this area
Silurian - Ordovician unnamed pelite
Lithology: mudstone
Devonian unnamed limestone conglomerate (Devonian) at surface, covers < 0.1 % of this area
Devonian unnamed limestone conglomerate
Lithology: conglomerate
Ordovician unnamed sulfidic pelite (Ordovician) at surface, covers < 0.1 % of this area
Ordovician unnamed sulfidic pelite
Lithology: mudstone
Ordovician Belle Lake Slate (Ordovician) at surface, covers < 0.1 % of this area
Ordovician Belle Lake Slate
Lithology: slate
Ordovician sandstone and pelite of the Depot Mountain sequence (Ordovician) at surface, covers 2 % of this area
Ordovician sandstone and pelite of the Depot Mountain sequence
Lithology: graywacke; slate; conglomerate

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