Geologic units in Aroostook county, Maine

Devonian Seboomook Formation (Devonian) at surface, covers 39 % of this area

Devonian Seboomook Formation

Silurian - Ordovician Carys Mills Formation (Silurian - Ordovician) at surface, covers 9 % of this area

Silurian - Ordovician Carys Mills Formation

Devonian - Silurian Madrid Formation (Devonian - Silurian) at surface, covers 6 % of this area

Devonian - Silurian Madrid Formation

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

Ordovician Winterville Formation (Ordovician) at surface, covers 4 % of this area

Ordovician Winterville Formation

Ordovician - Cambrian Saint Daniel Formation (Ordovician - Cambrian) at surface, covers 3 % of this area

Ordovician - Cambrian Saint Daniel formation

Silurian Smyrna Mills Formation (Silurian) at surface, covers 3 % of this area

Silurian Smyrna Mills Formation

Ordovician Madawaska Lake Formation (Ordovician) at surface, covers 3 % of this area

Ordovician Madawaska Lake Formation

Devonian Swanback Formation (Devonian) at surface, covers 2 % of this area

Devonian Swanback Formation

Silurian New Sweden Formation (Silurian) at surface, covers 2 % of this area

Silurian New Sweden Formation

Devonian Seboomook Formation, unnamed pelite (Devonian) at surface, covers 2 % of this area

Devonian Seboomook Formation unnamed pelite

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

Devonian - Silurian unnamed sedimentary rocks (Devonian - Silurian) at surface, covers 2 % of this area

Devonian - Silurian unnamed sedimentary rocks

Silurian Frenchville Formation (Silurian) at surface, covers 1 % of this area

Silurian Frenchville Formation

Silurian Jemtland Formation (Silurian) at surface, covers 1 % of this area

Silurian Jemtland Formation

Silurian Spragueville Formation (Silurian) at surface, covers 1 % of this area

Silurian Spragueville Formation

Cambrian Grand Pitch Formation (Cambrian) at surface, covers 1 % of this area

Cambrian Grand Pitch Formation

Devonian - Silurian Fish River Lake Formation (Devonian - Silurian) at surface, covers 0.9 % of this area

Devonian - Silurian Fish River Lake Formation

Devonian - Silurian Fogelin Hill Formation (Devonian - Silurian) at surface, covers 0.7 % of this area

Devonian - Silurian Fogelin Hill Formation

Devonian - Silurian Bell Brook Formation, pelite member (Devonian - Silurian) at surface, covers 0.7 % of this area

Devonian - Silurian Bell Brook Formation pelite member

Ordovician unnamed volcanic rocks (Ordovician) at surface, covers 0.6 % of this area

Ordovician unnamed volcanic rocks

Ordovician - Cambrian unnamed sedimentary rocks (Ordovician - Cambrian) at surface, covers 0.6 % of this area

Ordovician - Cambrian unnamed sedimentary rocks

Ordovician Munsungun Lake Formation (Ordovician) at surface, covers 0.6 % of this area

Ordovician Munsungun Lake Formation

Silurian - Ordovician Dunn Brook Formation (Silurian - Ordovician) at surface, covers 0.6 % of this area

Silurian - Ordovician Dunn Brook formation

Ordovician - Cambrian Chase Brook Formation (Ordovician - Cambrian) at surface, covers 0.5 % of this area

Ordovician - Cambrian Chase Brook Formation

Devonian granite (Devonian) at surface, covers 0.5 % of this area

Devonian granite

Devonian granite (hornblende accessory mineral) (Devonian) at surface, covers 0.5 % of this area

Hornblende-biotite granite undivided

Devonian unnamed sedimentary rocks (Devonian) at surface, covers 0.5 % of this area

Devonian unnamed sedimentary rocks

Ordovician graywacke of the Depot Mountain sequence (Ordovician) at surface, covers 0.5 % of this area

Ordovician graywacke of the Depot Mountain sequence

Silurian - Ordovician Mattawamkeag Formation (Silurian - Ordovician) at surface, covers 0.5 % of this area

Silurian - Ordovician Mattawamkeag Formation

Silurian unnamed conglomerate (Silurian) at surface, covers 0.5 % of this area

Silurian unnamed conglomerate

Silurian unnamed limestone (Silurian) at surface, covers 0.4 % of this area

Silurian unnamed limestone

Devonian Chapman Sandstone (Devonian) at surface, covers 0.4 % of this area

Devonian Chapman Sandstone

Silurian unnamed sandstone (Silurian) at surface, covers 0.4 % of this area

Silurian unnamed sandstone

Devonian Hedgehog Formation (Devonian) at surface, covers 0.4 % of this area

Devonian Hedgehog Formation

Devonian unnamed pelite (Devonian) at surface, covers 0.4 % of this area

Devonian unnamed pelite

Silurian rocks of the Fivemile Brook sequence (Silurian) at surface, covers 0.3 % of this area

Silurian rocks of the Fivemile Brook sequence

Silurian - Ordovician Carys Mills Formation, lower member (Silurian - Ordovician) at surface, covers 0.3 % of this area

Silurian - Ordovician Carys Mills Formation lower member

Ordovician Chandler Ridge Formation (Ordovician) at surface, covers 0.2 % of this area

Ordovician Chandler Ridge Formation

Silurian - Ordovician Carys Mills Formation, pelite member (Silurian - Ordovician) at surface, covers 0.2 % of this area

Silurian - Ordovician Carys Mills Formation pelite member

Silurian unnamed sedimentary rocks (Silurian) at surface, covers 0.2 % of this area

Silurian unnamed sedimentary rocks

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

Silurian Maple Mountain Formation (Silurian) at surface, covers 0.2 % of this area

Silurian Maple Mountain Formation

Ordovician quartz diorite (hornblende accessory mineral) (Ordovician) at surface, covers 0.2 % of this area

Ordovician quartz diorite (hornblende accessory mineral)

Silurian Burnt Brook Formation (Silurian) at surface, covers 0.2 % of this area

Silurian Burnt Brook Formation

Devonian - Silurian Daggett Ridge Formation (Devonian - Silurian) at surface, covers 0.1 % of this area

Devonian - Silurian Daggett Ridge Formation

Ordovician unnamed pelite (Ordovician) at surface, covers 0.1 % of this area

Ordovician unnamed pelite

Devonian Hartin Formation (Devonian) at surface, covers 0.1 % of this area

Devonian Hartin Formation

Silurian - Ordovician unnamed pelite (Silurian - Ordovician) at surface, covers 0.1 % of this area

Silurian - Ordovician unnamed pelite

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

Silurian - Ordovician Nine Lake formation (Silurian - Ordovician) at surface, covers 0.1 % of this area

Silurian - Ordovician Nine Lake formation

Devonian Mapleton Formation (Devonian) at surface, covers 0.1 % of this area

Devonian Mapleton Formation

Devonian - Silurian Bell Brook Formation, conglomerate member (Devonian - Silurian) at surface, covers 0.1 % of this area

Devonian - Silurian Bell Brook Formation, conglomerate member

Ordovician tuff of the Depot Mountain sequence (Ordovician) at surface, covers < 0.1 % of this area

Ordovician tuff of the Depot Mountain sequence

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

Devonian Edmunds Hill Andesite (Devonian) at surface, covers < 0.1 % of this area

Devonian Edmunds Hill Andesite

Cambrian Jim Pond Formation, mafic volcanic rocks (Cambrian) at surface, covers < 0.1 % of this area

Cambrian Jim Pond Formation mafic volcanic rocks

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

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

Silurian Rocky Mountain Quartz Latite (Silurian) at surface, covers < 0.1 % of this area

Silurian Rocky Mountain Quartz Latite

Silurian unnamed volcanic and sedimentary rocks (Silurian) at surface, covers < 0.1 % of this area

Silurian unnamed volcanic and sedimentary rocks

Devonian - Ordovician Spruce Top Greenstone (Devonian - Ordovician) at surface, covers < 0.1 % of this area

Devonian - Ordovician Spruce Top Greenstone

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

Devonian Seboomook Formation, unnamed quartzite (Devonian) at surface, covers < 0.1 % of this area

Devonian Seboomook Formation unnamed quartzite

Devonian granodiorite (hornblende accessory mineral) (Devonian) at surface, covers < 0.1 % of this area

Hornblende-biotite granodiorite

Silurian - Ordovician Aroostook River Formation (Silurian - Ordovician) at surface, covers < 0.1 % of this area

Silurian - Ordovician Aroostook River Formation

Silurian - Ordovician Mars Hill Conglomerate (Silurian - Ordovician) at surface, covers < 0.1 % of this area

Silurian - Ordovician Mars Hill Conglomerate

Devonian granodiorite (hornblende accessory mineral, porphyritic texture) (Devonian) at surface, covers < 0.1 % of this area

Porphyritic hornblende-biotite granodiorite

Ordovician granodiorite (Ordovician) at surface, covers < 0.1 % of this area

Ordovician biotite granodiorite

Devonian syenite, monzodiorite (porphyritic texture) (Devonian) at surface, covers < 0.1 % of this area

Devonian pyroxene-hornblende-biotite syenite and monzodiorite

Ordovician Pile Mountain Argillite (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Pile Mountain Argillite

Ordovician gabbro/diorite/ultramafic rocks (Ordovician) at surface, covers < 0.1 % of this area

Ordovician gabbro/diorite/ultramafic rocks

Ordovician Shin Brook Formation (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Shin Brook Formation

Ordovician Chase Lake Formation (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Chase lake formation

Ordovician unnamed felsic volcanic rocks (Ordovician) at surface, covers < 0.1 % of this area

Ordovician unnamed felsic volcanic rocks

Devonian unnamed limestone conglomerate (Devonian) at surface, covers < 0.1 % of this area

Devonian unnamed limestone conglomerate

Ordovician Belle Lake Slate (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Belle Lake Slate

Ordovician unnamed mafic volcanic rocks (Ordovician) at surface, covers < 0.1 % of this area

Ordovician unnamed mafic volcanic rocks

Ordovician unnamed sandstone and pelite (Ordovician) at surface, covers < 0.1 % of this area

Ordovician unnamed sandstone and pelite

Devonian granite (muscovite accessory mineral) (Devonian) at surface, covers < 0.1 % of this area

Muscovite-biotite granite undivided

Ordovician unnamed sulfidic pelite (Ordovician) at surface, covers < 0.1 % of this area

Ordovician unnamed sulfidic pelite

Ordovician unnamed volcanic and sedimentary rocks (Ordovician) at surface, covers < 0.1 % of this area

Ordovician unnamed volcanic and sedimentary rocks

Devonian granite (granophyric texture) (Devonian) at surface, covers < 0.1 % of this area

Devonian granite (granophyric texture)

Devonian syenite (pyroxene plus hornblende accessory mineral) (Devonian) at surface, covers < 0.1 % of this area

Devonian pyroxene-hornblende-biotite syenite undivided

Devonian unnamed conglomerate (Devonian) at surface, covers < 0.1 % of this area

Devonian unnamed conglomerate

Silurian - Precambrian Z ultramafic rocks (Silurian - Precambrian Z) at surface, covers < 0.1 % of this area

Silurian - Precambrian Z ultramafic rocks