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

Geologic units in Piscataquis county, Maine

Devonian - Silurian Frost Pond Formation (Devonian - Silurian) at surface, covers < 0.1 % of this area

Devonian - Silurian Frost Pond Formation

Lithology: mudstone

Silurian Ripogenus Formation (Silurian) at surface, covers 0.5 % of this area

Silurian Ripogenus Formation

Lithology: sandstone

Silurian Rangeley Formation "C" member (Silurian) at surface, covers < 0.1 % of this area

Silurian Rangeley Formation "C" member

Lithology: sandstone; conglomerate; shale; limestone

Ordovician Chase lake formation (Ordovician) at surface, covers 0.4 % of this area

Ordovician Chase lake formation

Lithology: graywacke; conglomerate; slate

Silurian Sangerville Formation Patch Mountain member (Silurian) at surface, covers < 0.1 % of this area

Silurian Sangerville Formation Patch Mountain member

Lithology: marble; calc-silicate rock; granofels; schist

Devonian Seboomook Formation unnamed pelite (Devonian) at surface, covers 0.7 % of this area

Devonian Seboomook Formation unnamed pelite

Lithology: mudstone

Devonian Carrabassett Formation quartzite member (Devonian) at surface, covers < 0.1 % of this area

Devonian Carrabassett Formation quartzite member

Lithology: quartzite

Devonian granite (Devonian) at surface, covers 10 % of this area

Devonian granite - biotite granite

Lithology: granite

Devonian Traveler Rhyolite Pogy member (Devonian) at surface, covers 1.0 % of this area

Devonian Traveler Rhyolite Pogy member

Lithology: rhyolite

Silurian Waterville Formation (Silurian) at surface, covers < 0.1 % of this area

Silurian Waterville Formation

Lithology: slate; schist; graywacke; calc-silicate rock; black shale

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

Silurian unnamed limestone

Lithology: limestone; dolostone (dolomite)

Devonian Tomhegan Formation (Devonian) at surface, covers 0.7 % of this area

Devonian Tomhegan Formation

Lithology: sandstone; slate; quartzite

Devonian Seboomook Formation (Devonian) at surface, covers 29 % of this area

Devonian Seboomook Formation

Lithology: mudstone; sandstone

Ordovician Bluffer Pond Formation rhyolite member (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Bluffer Pond Formation rhyolite member

Lithology: rhyolite

Ordovician Dry Wall Volcanic rocks (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Dry Wall Volcanic rocks

Lithology: basalt

Devonian Seboomook Formation unnamed mafic greenstone (Silurian-Devonian) at surface, covers < 0.1 % of this area

Devonian Seboomook Formation unnamed mafic greenstone

Lithology: greenstone

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

Silurian - Ordovician Lobster Lake Formation

Lithology: sandstone; siltstone; conglomerate; slate; quartzite; shale

Ordovician - Cambrian Dead River formation upper member (Ordovician - Cambrian) at surface, covers < 0.1 % of this area

Ordovician - Cambrian Dead River formation upper member

Lithology: phyllite; quartzite

Devonian granodiorite - quartz diorite (Devonian) at surface, covers 0.5 % of this area

Devonian granodiorite - quartz diorite - Devonian biotite granodiorite to biotite quartz diorite - biotite granodiorite, biotite tonalite, biotite quartz syenite, biotite quartz monzodiorite, and biotite quartz diorite.

Lithology: granodiorite; tonalite; quartz syenite; quartz monzodiorite; quartz diorite

Devonian Seboomook Formation Mount Blue member (Devonian) at surface, covers 0.2 % of this area

Devonian Seboomook Formation Mount Blue member

Lithology: schist; metasedimentary rock

Devonian - Silurian undifferentiated sedimentary rocks of the Spider Lake, Chandler Pond and Third Lake Formations (Devonian - Silurian) at surface, covers 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)

Devonian Carrabassett Formation thinly layered member (Devonian) at surface, covers 0.1 % of this area

Devonian Carrabassett Formation thinly layered member

Lithology: mudstone; sandstone

Tomhegan Formation, Kineo Rhyolite Member, Massive Felsite (Devonian) at surface, covers 0.1 % of this area

Tomhegan Formation, Kineo Rhyolite Member, Massive Felsite

Lithology: rhyolite

Devonian granite (granophyric texture) (Devonian) at surface, covers 0.4 % of this area

Devonian granite (granophyric texture)

Lithology: granite

Ordovician Holmes Hole Formation (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Holmes Hole Formation

Lithology: mudstone

Ordovician - Cambrian Dead River formation lower member (Ordovician - Cambrian) at surface, covers 0.2 % of this area

Ordovician - Cambrian Dead River formation lower member

Lithology: quartzite; phyllite

Devonian Tarratine Formation Misery Quartzite (Devonian) at surface, covers < 0.1 % of this area

Devonian Tarratine Formation Misery Quartzite

Lithology: quartzite

Devonian Tarratine Formation (Devonian) at surface, covers 1 % of this area

Devonian Tarratine Formation

Lithology: sandstone; slate; siltstone; limestone; quartzite

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

Devonian Hildreths Formation

Lithology: calc-silicate rock; marble; graywacke; schist

Devonian Carrabassett Formation (Devonian) at surface, covers 8 % of this area

Devonian Carrabassett Formation

Lithology: schist; metasedimentary rock; gneiss

Cambrian Hurricane Mountain Formation (Cambrian) at surface, covers 1 % of this area

Cambrian Hurricane Mountain Formation

Lithology: melange

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

Devonian quartz diorite (hornblende accessory mineral) - Devonian hornblende-biotite quartz diorite

Lithology: quartz diorite

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

Ordovician Chase Lake Formation sandstone and pelite member

Lithology: graywacke; slate

Cambrian Jim Pond Formation mafic volcanic rocks (Cambrian) at surface, covers 0.7 % of this area

Cambrian Jim Pond Formation mafic volcanic rocks

Lithology: greenstone

Ordovician Lobster Mountain volcanic complex andesite member (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Lobster Mountain volcanic complex andesite member

Lithology: andesite

Silurian West Branch Volcanic Rocks (Silurian) at surface, covers < 0.1 % of this area

Silurian West Branch Volcanic Rocks

Lithology: volcanic rock

Ordovician unnamed volcanic rocks (Ordovician) at surface, covers 2 % of this area

Ordovician unnamed volcanic rocks

Lithology: mafic volcanic rock; felsic volcanic rock

Ordovician Lobster Mountain volcanic complex (Ordovician) at surface, covers 0.8 % of this area

Ordovician Lobster Mountain volcanic complex

Lithology: felsic volcanic rock; conglomerate

Undifferentiated mafic to felsic volcanic rocks (Devonian - Ordovician) at surface, covers 2 % of this area

Undifferentiated mafic to felsic volcanic rocks

Lithology: mafic volcanic rock; felsic volcanic rock

Devonian Carrabassett Formation massive pelite member (Devonian) at surface, covers 6 % of this area

Devonian Carrabassett Formation massive pelite member

Lithology: mudstone

Ordovician Munsungun Lake Formation (Ordovician) at surface, covers 2 % of this area

Ordovician Munsungun Lake Formation

Lithology: felsic volcanic rock; sandstone; shale; chert; basalt

Devonian - Silurian Madrid Formation (Devonian - Silurian) at surface, covers 7 % of this area

Devonian - Silurian Madrid Formation

Lithology: quartzite; calc-silicate rock

Devonian Ironbound Mountain Formation (Devonian) at surface, covers 1 % of this area

Devonian Ironbound Mountain Formation

Lithology: slate

Ordovician Chase lake Formation conglomerate member (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Chase lake Formation conglomerate member

Lithology: conglomerate

Cambrian Caucomgomoc Lake Formation, basalt member (Cambrian) at surface, covers 0.3 % of this area

Cambrian Caucomgomoc Lake Formation, basalt member

Lithology: basalt

Undifferentiated volcanic rocks of the Spider Lake and Chandler Pond Formations (Devonian - Silurian) at surface, covers 3 % of this area

Undifferentiated volcanic rocks of the Spider Lake and Chandler Pond Formations

Lithology: andesite

Traveler Rhyolite, Black Cat Member (Devonian) at surface, covers 0.7 % of this area

Traveler Rhyolite, Black Cat Member

Lithology: rhyolite

Devonian granite (Devonian) at surface, covers 0.9 % of this area

Devonian granite

Lithology: granite

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

Devonian granodiorite - quartz monzodiorite (hornblende accessory mineral) - Devonian hornblende-biotite granodiorite to quartz monzodiorite - hornblende-biotite granodiorite, hornblende-biotite tonalite, hornblende-biotite quartz syenite, and hornblende-biotite quartz monzodiorite.

Lithology: granodiorite; tonalite; quartz syenite; quartz monzodiorite

Ordovician - Cambrian unnamed volcanic rocks (Ordovician - Cambrian) at surface, covers 0.1 % of this area

Ordovician - Cambrian unnamed volcanic rocks

Lithology: mafic volcanic rock; felsic volcanic rock

Cambrian Caucomgomoc Lake Formation, quartzwacke and pelite member (Cambrian) at surface, covers < 0.1 % of this area

Cambrian Caucomgomoc Lake Formation quartzwacke and pelite member

Lithology: sandstone; mudstone

Ordovician - Cambrian Hurd Mountain formation basalt member (Ordovician - Cambrian) at surface, covers 0.1 % of this area

Ordovician - Cambrian Hurd Mountain formation basalt member

Lithology: basalt

Ordovician gabbro/diorite/ultramafic rocks (Ordovician) at surface, covers 0.4 % of this area

Ordovician gabbro/diorite/ultramafic rocks

Lithology: gabbro; diorite; ultramafic intrusive rock

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

Devonian gabbro

Lithology: gabbro

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

Devonian unnamed lithic sandstone and conglomerate

Lithology: graywacke; conglomerate

Silurian undifferentiated pelites and sandstones (Silurian) at surface, covers < 0.1 % of this area

Silurian undifferentiated pelites and sandstones, in part of the Allsbury Formation and in part unnamed

Lithology: slate; sandstone; conglomerate; graywacke

Whiskey Quartzite (Devonian) at surface, covers < 0.1 % of this area

Whiskey Quartzite

Lithology: quartzite

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

Devonian unnamed garnet rhyolite

Lithology: rhyolite

Silurian Perry Mountain formation (Silurian) at surface, covers 0.2 % of this area

Silurian Perry Mountain formation

Lithology: sandstone; shale; quartzite

Ordovician - Cambrian Hurd Mountain formation (Ordovician - Cambrian) at surface, covers 0.3 % of this area

Ordovician - Cambrian Hurd Mountain formation

Lithology: melange

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

Ordovician Blind Brook Formation

Lithology: mudstone

Devonian Trout Valley Formation (Devonian) at surface, covers 0.3 % of this area

Devonian Trout Valley Formation

Lithology: sandstone; conglomerate; clastic

Devonian quartz monzonite (Devonian) at surface, covers < 0.1 % of this area

Devonian quartz monzonite

Lithology: quartz monzonite

Silurian - Ordovician Frontenac Formation (Silurian - Ordovician) at surface, covers 0.7 % of this area

Silurian - Ordovician Frontenac Formation

Lithology: graywacke; slate

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

Devonian gabbro/diorite/ultramafic rocks

Lithology: gabbro; diorite; ultramafic intrusive rock

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

Devonian Matagamon Sandstone

Lithology: sandstone; slate; argillite

Silurian Sangerville Formation (Silurian) at surface, covers 4 % of this area

Silurian Sangerville Formation

Lithology: sandstone; shale; limestone; calc-silicate rock; granofels; schist; metasedimentary rock; conglomerate

Ordovician - Cambrian Southeast Cove Formation (Ordovician - Cambrian) at surface, covers 0.1 % of this area

Ordovician - Cambrian Southeast Cove Formation

Lithology: mudstone; sandstone

Ordovician - Cambrian unnamed sedimentary rocks (Ordovician - Cambrian) at surface, covers 2 % of this area

Ordovician - Cambrian unnamed sedimentary rocks

Lithology: mudstone; sandstone

Cambrian Loon Stream Formation (Cambrian) at surface, covers 0.2 % of this area

Cambrian Loon Stream Formation

Lithology: sandstone; mudstone

Devonian diorite (Devonian) at surface, covers 1 % of this area

Devonian diorite - biotite diorite

Lithology: diorite

Ordovician Bluffer Pond formation (Ordovician) at surface, covers 2 % of this area

Ordovician Bluffer Pond formation

Lithology: basalt

Silurian Sangerville Formation conglomerate member (Silurian) at surface, covers 0.2 % of this area

Silurian Sangerville Formation conglomerate member

Lithology: conglomerate

Silurian Capens Formation (Silurian) at surface, covers < 0.1 % of this area

Silurian Capens Formation

Lithology: slate; conglomerate

Silurian The Forks Formation (Silurian) at surface, covers 0.2 % of this area

Silurian The Forks Formation

Lithology: metasedimentary rock; marble

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

Devonian unnamed rhyolite

Lithology: rhyolite

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

Cambrian gabbro/diorite/ultramafic rocks

Lithology: gabbro; diorite; ultramafic intrusive rock

Silurian Smalls Falls Formation (Silurian) at surface, covers 0.3 % of this area

Silurian Smalls Falls Formation

Lithology: shale; sandstone; calc-silicate rock

Ordovician Lobster Mountain volcanic complex basalt member (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Lobster Mountain volcanic complex basalt member

Lithology: basalt

Devonian quartz monzodiorite - quartz diorite (pyroxene plus hornblende accessory mineral) (Devonian) at surface, covers < 0.1 % of this area

Devonian quartz monzodiorite - quartz diorite (pyroxene plus hornblende accessory mineral) - Devonian pyroxene-hornblende-biotite quartz monzodiorite to quartz diorite - pyroxene-hornblende-biotite quartz monzodiorite and pyroxene-hornblende-biotite quartz diorite.

Lithology: quartz monzodiorite; quartz diorite

Devonian - Silurian Allagash Lake Formation mixed sedimentary rocks (Devonian - Silurian) at surface, covers < 0.1 % of this area

Devonian - Silurian Allagash Lake Formation mixed sedimentary rocks

Lithology: mudstone; sandstone; limestone; dolostone (dolomite)

Ordovician - Cambrian Chase Brook Formation (Ordovician - Cambrian) at surface, covers 2 % of this area

Ordovician - Cambrian Chase Brook Formation

Lithology: slate; limestone; siltstone

Silurian Sangerville Formation limestone member (Silurian) at surface, covers 0.7 % of this area

Silurian Sangerville Formation limestone member

Lithology: marble; calc-silicate rock; granofels; schist

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

Devonian Seboomook Formation unnamed conglomerate

Lithology: conglomerate

Devonian - Silurian Allagash Lake Formation, basalt and mixed sedimentary rocks (Devonian - Silurian) at surface, covers 0.5 % of this area

Devonian - Silurian Allagash Lake Formation, basalt and mixed sedimentary rocks

Lithology: basalt

Ordovician - Cambrian Sawmill Formation (Ordovician - Cambrian) at surface, covers 0.4 % of this area

Ordovician - Cambrian Sawmill Formation

Lithology: mudstone; sandstone

Devonian granodiorite (hornblende accessory mineral) (Devonian) at surface, covers 0.8 % of this area

Devonian granodiorite (hornblende accessory mineral) - hornblende-biotite granodiorite

Lithology: granodiorite