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

Geologic units in Washington county, Maine

[Additional scientific data in this geographic area]

Silurian Quoddy Formation mafic to felsic volcanic rock member (Silurian) at surface, covers 2 % of this area

Silurian Quoddy Formation mafic to felsic volcanic rock member

Lithology: mafic volcanic rock; felsic volcanic rock

Devonian Eastport Formation pelite member (Devonian) at surface, covers < 0.1 % of this area

Devonian Eastport Formation pelite member

Lithology: mudstone

Devonian Perry Formation sandstone member (Devonian) at surface, covers 0.6 % of this area

Devonian Perry Formation sandstone member

Lithology: sandstone; conglomerate

Silurian Dennys Formation mafic to felsic volcanic rock member (Silurian) at surface, covers 3 % of this area

Silurian Dennys Formation mafic to felsic volcanic rock member

Lithology: mafic volcanic rock; felsic volcanic rock

Silurian - Ordovician Vassalboro formation (Silurian - Ordovician) at surface, covers 0.6 % of this area

Silurian - Ordovician Vassalboro formation

Lithology: sandstone; quartzite; schist; limestone

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

Devonian syenite - Devonian biotite syenite undivided

Lithology: syenite

Silurian Oak Bay formation (Silurian) at surface, covers < 0.1 % of this area

Silurian Oak Bay formation

Lithology: conglomerate; arkose

Silurian Leighton Formation mafic to felsic volcanic rock member (Silurian) at surface, covers 1.0 % of this area

Silurian Leighton Formation mafic to felsic volcanic rock member

Lithology: mafic volcanic rock; felsic volcanic rock

Ordovician - Cambrian Cookson Formation mafic to felsic volcanic rocks (Ordovician - Cambrian) at surface, covers < 0.1 % of this area

Ordovician - Cambrian Cookson Formation mafic to felsic volcanic rocks

Lithology: mafic volcanic rock; felsic volcanic rock

Devonian granite (Devonian) at surface, covers 9 % of this area

Devonian granite

Lithology: granite

Devonian - Ordovician Bucksport Formation (Devonian - Ordovician) at surface, covers 0.5 % of this area

Devonian - Ordovician Bucksport Formation

Lithology: sandstone; limestone; calc-silicate rock

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

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

Lithology: quartz monzonite

Devonian - Ordovician Dideguash Formation (Devonian - Ordovician) at surface, covers 3 % of this area

Devonian - Ordovician Dideguash Formation

Lithology: mudstone; sandstone

Unnamed volcanic rocks (Devonian - Silurian) at surface, covers 2 % of this area

Unnamed volcanic rocks

Lithology: felsic volcanic rock; mafic volcanic rock

Ordovician - Cambrian Cookson formation (Ordovician - Cambrian) at surface, covers < 0.1 % of this area

Ordovician - Cambrian Cookson formation

Lithology: slate; phyllite; graywacke

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

Devonian - Silurian Daggett Ridge Formation (Devonian - Silurian) at surface, covers 0.3 % of this area

Devonian - Silurian Daggett Ridge Formation

Lithology: sandstone; conglomerate

Devonian gabbro/diorite/ultramafic rocks (Devonian) at surface, covers 2 % of this area

Devonian gabbro/diorite/ultramafic rocks

Lithology: gabbro; diorite; ultramafic intrusive rock

Devonian Eastport Formation mafic to felsic volcanic member (Devonian) at surface, covers 2 % of this area

Devonian Eastport Formation mafic to felsic volcanic member

Lithology: mafic volcanic rock; felsic volcanic rock

Silurian Hersey formation (Silurian) at surface, covers 0.4 % of this area

Silurian Hersey formation

Lithology: shale

Devonian gabbro/diorite/ultramafic rocks - quartz diorite (Devonian) at surface, covers 11 % of this area

Devonian gabbro/diorite/ultramafic rocks - quartz diorite - Devonian gabbro/diorite/ultramafic rocks to biotite quartz diorite - gabbro, diorite, ultramafic rocks, biotite monzodiorite, biotite syenite, and biotite quartz diorite.

Lithology: gabbro; diorite; ultramafic intrusive rock; monzodiorite; syenite; quartz diorite

Ordovician - Cambrian unnamed sedimentary rocks (Ordovician - Cambrian) at surface, covers 6 % of this area

Ordovician - Cambrian unnamed sedimentary rocks

Lithology: mudstone; sandstone

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

Ordovician unnamed pelite

Lithology: mudstone

Silurian Dennys formation basalt member (Silurian) at surface, covers 0.4 % of this area

Silurian Dennys formation basalt member

Lithology: basalt

Ordovician unnamed felsic volcanic rocks (Ordovician) at surface, covers 1 % of this area

Ordovician unnamed felsic volcanic rocks

Lithology: felsic volcanic rock

Silurian Edmunds formation (Silurian) at surface, covers 3 % of this area

Silurian Edmunds formation

Lithology: mafic volcanic rock; felsic volcanic rock

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

Devonian Hartin Formation

Lithology: sandstone

Ordovician - Precambrian Z Columbia Falls Formation (Ordovician - Precambrian Z) at surface, covers 3 % of this area

Ordovician - Precambrian Z Columbia Falls Formation

Lithology: mafic volcanic rock; felsic volcanic rock

Silurian Leighton Formation basalt member (Silurian) at surface, covers 0.2 % of this area

Silurian Leighton Formation basalt member

Lithology: basalt

Ordovician - Cambrian Cookson Formation lithic sandstone and pelite (Ordovician - Cambrian) at surface, covers < 0.1 % of this area

Ordovician - Cambrian Cookson Formation lithic sandstone and pelite

Lithology: mudstone; sandstone

Devonian - Silurian unnamed conglomerate (Devonian - Silurian) at surface, covers 0.3 % of this area

Devonian - Silurian unnamed conglomerate

Lithology: conglomerate

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

Devonian granite (hornblende accessory mineral) - hornblende-biotite granite undivided

Lithology: granite

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

Devonian granite (hornblende accessory mineral); hornblende-biotite granite

Lithology: granite

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

Ordovician unnamed mafic volcanic rocks

Lithology: mafic volcanic rock

Silurian gabbro/diorite/ultramafic rocks (Silurian) at surface, covers 2 % of this area

Silurian gabbro/diorite/ultramafic rocks

Lithology: gabbro; diorite; ultramafic intrusive rock

Devonian granite (porphyritic texture) (Devonian) at surface, covers 0.7 % of this area

Devonian granite (porphyritic texture) - biotite granite undivided

Lithology: granite

Silurian unnamed sandstone (Silurian) at surface, covers 0.6 % of this area

Silurian unnamed sandstone

Lithology: sandstone

Silurian Quoddy Formation undifferentiated volcanic rock member (Silurian) at surface, covers 0.6 % of this area

Silurian Quoddy Formation undifferentiated volcanic rock member

Lithology: volcanic rock (aphanitic)

Devonian granite (Devonian) at surface, covers 7 % of this area

Devonian granite - biotite granite

Lithology: granite

Ordovician - Cambrian Cookson Formation sulfidic pelite (Ordovician - Cambrian) at surface, covers 2 % of this area

Ordovician - Cambrian Cookson Formation sulfidic pelite

Lithology: mudstone

Silurian Quoddy formation pelite member (Silurian) at surface, covers 1 % of this area

Silurian Quoddy formation pelite member

Lithology: mudstone

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

Devonian granite (pyroxene plus hornblende accessory mineral) - pyroxene-hornblende-biotite granite undivided

Lithology: granite

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

Devonian unnamed limestone conglomerate

Lithology: conglomerate

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

Penobscot Formation

Lithology: slate; schist; quartztite

Devonian alkali feldspar granite (Devonian) at surface, covers 9 % of this area

Devonian alkali feldspar granite; alkali feldspar-biotite granite

Lithology: granite

Ordovician - Cambrian Cookson Formation sulfidic quartzose sandstone (Ordovician - Cambrian) at surface, covers 2 % of this area

Ordovician - Cambrian Cookson Formation sulfidic quartzose sandstone

Lithology: sandstone

Devonian Perry Formation basalt member (Devonian) at surface, covers 0.2 % of this area

Devonian Perry Formation basalt member - Matagamon Sandstone, Perry Formation, Basalt Member

Lithology: basalt

Ordovician unnamed sulfidic pelite (Ordovician) at surface, covers 0.3 % of this area

Ordovician unnamed sulfidic pelite

Lithology: mudstone

Ordovician Belle Lake Slate (Ordovician) at surface, covers 0.4 % of this area

Ordovician Belle Lake Slate

Lithology: slate

Silurian Leighton Formation pelite member (Silurian) at surface, covers < 0.1 % of this area

Silurian Leighton Formation pelite member

Lithology: mudstone

Devonian granite-quartz monzonite (hornblende accessory mineral) (Devonian) at surface, covers 0.4 % 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

Devonian Eastport Formation basalt member (Devonian) at surface, covers 0.5 % of this area

Devonian Eastport Formation basalt member

Lithology: basalt

Devonian - Ordovician Flume Ridge Formation (Devonian - Ordovician) at surface, covers 17 % of this area

Devonian - Ordovician Flume Ridge Formation

Lithology: graywacke; siltstone; slate