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

Geologic units in Penobscot county, Maine

[Additional scientific data in this geographic area]

Silurian unnamed sedimentary rocks (Silurian) at surface, covers 0.3 % of this area

Silurian unnamed sedimentary rocks

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

Ordovician gabbro/diorite/ultramafic rocks (Ordovician) at surface, covers 0.2 % of this area

Ordovician gabbro/diorite/ultramafic rocks

Lithology: gabbro; diorite; ultramafic intrusive rock

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

Silurian unnamed conglomerate

Lithology: conglomerate; quartz-feldspar schist

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

Devonian monzodiorite - Devonian biotite monzodiorite

Lithology: monzodiorite

Devonian quartz monzonite (hornblende accessory mineral) (Devonian) at surface, covers 4 % of this area

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

Lithology: quartz monzonite

Devonian - Ordovician Bucksport Formation (Devonian - Ordovician) at surface, covers 2 % of this area

Devonian - Ordovician Bucksport Formation

Lithology: sandstone; limestone; calc-silicate rock

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

Silurian - Ordovician Mattawamkeag Formation

Lithology: mudstone; sandstone

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

Devonian granite

Lithology: granite

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 - Precambrian Z Cape Elizabeth Formation (Ordovician - Precambrian Z) at surface, covers < 0.1 % of this area

Ordovician - Precambrian Z Cape Elizabeth Formation

Lithology: slate; schist; quartzite; phyllite

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

Ordovician - Cambrian unnamed sedimentary rocks

Lithology: mudstone; sandstone

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

Devonian - Silurian unnamed sedimentary rocks

Lithology: mudstone; sandstone

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

Devonian - Ordovician unnamed pelite

Lithology: mudstone

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

Silurian Sangerville Formation

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

Devonian Matagamon Sandstone (Devonian) at surface, covers 0.7 % of this area

Devonian Matagamon Sandstone

Lithology: sandstone; slate; argillite

Ordovician Wassataquoik Chert (Ordovician) at surface, covers 0.5 % of this area

Ordovician Wassataquoik Chert

Lithology: chert; iron formation

Carboniferous - Devonian unnamed conglomerate and sandstone (Carboniferous and/or Devonian) at surface, covers < 0.1 % of this area

Carboniferous - Devonian unnamed conglomerate and sandstone

Lithology: conglomerate; sandstone

Ordovician - Precambrian Z calc-silicate rocks of the Passagassawakeag block (Ordovician - Precambrian Z) at surface, covers < 0.1 % of this area

Ordovician - Precambrian Z calc-silicate rocks of the Passagassawakeag block

Lithology: calc-silicate rock

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

Silurian - Ordovician unnamed volcanic rocks

Lithology: mafic volcanic rock; felsic volcanic rock

Silurian Perry Mountain formation (Silurian) at surface, covers 0.1 % of this area

Silurian Perry Mountain formation

Lithology: sandstone; shale; quartzite

Silurian undifferentiated pelites and sandstones (Silurian) at surface, covers 14 % of this area

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

Lithology: slate; sandstone; conglomerate; graywacke

Silurian Waterville Formation limestone member (Silurian) at surface, covers 0.4 % of this area

Silurian Waterville Formation limestone member

Lithology: calc-silicate rock; metasedimentary rock; marble; slate; schist; black shale

Ordovician - Precambrian Z metasedimentary and metavolcanic rocks of the Passagassawakeag block (Ordovician - Precambrian Z) at surface, covers 0.6 % of this area

Ordovician - Precambrian Z metasedimentary and metavolcanic rocks of the Passagassawakeag block

Lithology: metasedimentary rock; metavolcanic rock

Silurian undifferentiated sandstones (Silurian) at surface, covers 1.0 % of this area

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

Lithology: sandstone

Ordovician quartz diorite (hornblende accessory mineral) (Ordovician) at surface, covers 0.6 % of this area

Ordovician quartz diorite (hornblende accessory mineral)

Lithology: quartz diorite

Devonian granodiorite (hornblende accessory mineral) (Devonian) at surface, covers 1 % of this area

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

Lithology: granodiorite

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

Silurian Sangerville Formation limestone member

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

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

Silurian - Ordovician unnamed conglomerate

Lithology: conglomerate

Silurian Smalls Falls Formation (Silurian) at surface, covers 0.2 % of this area

Silurian Smalls Falls Formation

Lithology: shale; sandstone; calc-silicate rock

Silurian - Ordovician Vassalboro formation (Silurian - Ordovician) at surface, covers 26 % of this area

Silurian - Ordovician Vassalboro formation

Lithology: sandstone; quartzite; schist; limestone

Devonian granite (Devonian) at surface, covers 3 % of this area

Devonian granite - biotite granite

Lithology: granite

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

Silurian unnamed sandstone (Silurian) at surface, covers 0.8 % of this area

Silurian unnamed sandstone

Lithology: sandstone

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

Devonian granite (porphyritic texture) - biotite granite undivided

Lithology: granite

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

Silurian unnamed conglomerate and sandstone

Lithology: sandstone; conglomerate

Ordovician - Precambrian Z interbedded pelite and quartz sandstone of the Passagassawakeag block (Ordovician - Precambrian Z) at surface, covers < 0.1 % of this area

Ordovician - Precambrian Z interbedded pelite and quartz sandstone of the Passagassawakeag block

Lithology: mudstone; sandstone

Devonian granodiorite - quartz diorite (Devonian) at surface, covers 0.6 % 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 granite (intrusive breccia texture) (Devonian) at surface, covers 0.5 % of this area

Devonian granite (intrusive breccia texture)

Lithology: granite

Devonian granite-quartz monzonite (hornblende accessory mineral) (Devonian) at surface, covers 2 % of this area

Devonian granite-quartz monzonite (hornblende accessory mineral) Devonian hornblende-biotite granite to quartz monzonite- hornblende-biotite granite, hornblende-biotite granodiorite, hornblende-biotite tonalite, hornblende-biotite alkali feldspar quartz syenite, hornblende-biotite quartz syenite, and hornblende-biotite quartz monzonite.

Lithology: granite; granodiorite; tonalite; quartz syenite; quartz monzonite

Ordovician Belle Lake Slate (Ordovician) at surface, covers 0.5 % of this area

Ordovician Belle Lake Slate

Lithology: slate

Ordovician unnamed sulfidic pelite (Ordovician) at surface, covers 0.2 % of this area

Ordovician unnamed sulfidic pelite

Lithology: mudstone

Devonian Seboomook Formation (Devonian) at surface, covers 3 % of this area

Devonian Seboomook Formation

Lithology: mudstone; sandstone

Cambrian Grand Pitch Formation (Cambrian) at surface, covers 3 % of this area

Cambrian Grand Pitch Formation

Lithology: mudstone; sandstone

Silurian unnamed limestone (Silurian) at surface, covers 3 % of this area

Silurian unnamed limestone

Lithology: limestone; dolostone (dolomite)

Silurian Waterville Formation (Silurian) at surface, covers 6 % of this area

Silurian Waterville Formation

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

Devonian Traveler Rhyolite Pogy member (Devonian) at surface, covers < 0.1 % of this area

Devonian Traveler Rhyolite Pogy member

Lithology: rhyolite

Devonian Carrabassett Formation (Devonian) at surface, covers 3 % of this area

Devonian Carrabassett Formation

Lithology: schist; metasedimentary rock; gneiss

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

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

Ordovician unnamed felsic volcanic rocks (Ordovician) at surface, covers 0.4 % of this area

Ordovician unnamed felsic volcanic rocks

Lithology: felsic volcanic rock

Devonian - Silurian undifferentiated sedimentary rocks of the Spider Lake, Chandler Pond and Third Lake Formations (Devonian - Silurian) at surface, covers 2 % 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 pelite (Ordovician) at surface, covers 0.2 % of this area

Ordovician unnamed pelite

Lithology: mudstone

Devonian - Silurian Madrid Formation (Devonian - Silurian) at surface, covers 13 % of this area

Devonian - Silurian Madrid Formation

Lithology: quartzite; calc-silicate rock

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

Ordovician unnamed volcanic rocks

Lithology: mafic volcanic rock; felsic volcanic rock

Cambrian Jim Pond Formation mafic volcanic rocks (Cambrian) at surface, covers 0.3 % of this area

Cambrian Jim Pond Formation mafic volcanic rocks

Lithology: greenstone

Devonian Swanback Formation (Devonian) at surface, covers 0.2 % of this area

Devonian Swanback Formation

Lithology: mudstone

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 Shin Brook Formation (Ordovician) at surface, covers 0.3 % of this area

Ordovician Shin Brook Formation

Lithology: rhyolite; siltstone; conglomerate; breccia