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

Geologic units in Oxford county, Maine

[Additional scientific data in this geographic area]

Carboniferous alkali feldspar granite (muscovite accessory, abundant sedimentary inclusions) (Carboniferous) at surface, covers 2 % of this area

Carboniferous alkali feldspar granite (muscovite accessory, abundant sedimentary inclusions) - muscovite-biotite granite

Lithology: granite

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

Silurian granite (Silurian) at surface, covers 0.1 % of this area

Silurian granite

Lithology: granite

Dead River Formation, undivided (Upper Cambrian? - Lower Ordovician?) at surface, covers < 0.1 % of this area

Dead River Formation, undivided - Thinly laminated, "pin-striped" gray, green, or tan metapelite and quartzite.

Lithology: meta-argillite; quartzite

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

Silurian - Ordovician Frontenac Formation

Lithology: graywacke; slate

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

Devonian - Cambrian unnamed sedimentary rocks

Lithology: mudstone; sandstone

Silurian Sangerville Formation Anasagunticook member (Silurian) at surface, covers 7 % of this area

Silurian Sangerville Formation Anasagunticook member

Lithology: metasedimentary rock; marble

Silurian Sangerville Formation (Silurian) at surface, covers 0.9 % of this area

Silurian Sangerville Formation

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

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

Silurian Sangerville Formation Anasagunticook member sulfidic pelite

Lithology: metasedimentary rock

Madrid and Smalls Falls Formations, undivided (Silurian) at surface, covers < 0.1 % of this area

Madrid and Smalls Falls Formations, undivided.

Lithology: granofels; schist; calc-silicate schist; pelitic schist

Silurian Perry Mountain formation (Silurian) at surface, covers 2 % of this area

Silurian Perry Mountain formation

Lithology: sandstone; shale; quartzite

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

Silurian Greenvale Cove Formation

Lithology: metasedimentary rock; calc-silicate rock

Ammonoosuc Volcanics, Volcaniclastic metagraywackes (Middle - Upper Ordovician) at surface, covers < 0.1 % of this area

Ammonoosuc Volcanics, Volcaniclastic metagraywackes.

Lithology: metasedimentary rock

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

Cambrian ultramafic rocks

Lithology: ultramafic intrusive rock

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

Cambrian unnamed mafic volcanic rocks

Lithology: mafic volcanic rock

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

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

Devonian granite

Lithology: granite

Ordovician - Cambrian unnamed volcanic rocks (Ordovician - Cambrian) at surface, covers 0.2 % of this area

Ordovician - Cambrian unnamed volcanic rocks

Lithology: mafic volcanic rock; felsic volcanic rock

Perry Mountain Formation, undivided (Lower? - Middle? Silurian) at surface, covers < 0.1 % of this area

Perry Mountain Formation, undivided - Sharply interbedded quartzites, light-gray nongraphitic metapelite, and "fast-graded" meta-turbidites. Coticule layers common.

Lithology: quartzite; meta-argillite; metasedimentary rock

Devonian - Silurian undifferentiated sedimentary rocks in areas of extreme migmatization (Devonian - Silurian) at surface, covers 0.4 % of this area

Devonian - Silurian undifferentiated sedimentary rocks in areas of extreme migmatization

Lithology: migmatite

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

Devonian granodiorite - biotite granodiorite

Lithology: granodiorite

Silurian Rangeley Formation "A" member lithic sandstone" (Silurian) at surface, covers 0.1 % of this area

Silurian Rangeley Formation "A" member lithic sandstone

Lithology: sandstone; conglomerate

Member C (uppermost) of the Rangeley Formation in Maine and northeastern and southwestern New Hampshire (Lower Silurian (Llandoverian)) at surface, covers < 0.1 % of this area

Member C (uppermost) of the Rangeley Formation in Maine and northeastern and southwestern New Hampshire - Quartz-pebble conglomerate overlain by rusty metapelite and feldspathic quartzite.

Lithology: conglomerate; meta-argillite; quartzite

Biotite granite (Late Ordovician) at surface, covers < 0.1 % of this area

Biotite granite - Pink, moderately to weakly foliated.

Lithology: granite

Ordovician Kamankeag Formation basalt and graywacke member (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Kamankeag Formation basalt and graywacke member

Lithology: graywacke; basalt

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

Ordovician unnamed volcanic and sedimentary rocks

Lithology: mafic volcanic rock; felsic volcanic rock; sedimentary rock

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

Ordovician - Cambrian Aziscohos Formation

Lithology: shale; quartzite; siltstone

Devonian Seboomook Formation Day Mountain member (Devonian) at surface, covers 1 % of this area

Devonian Seboomook Formation Day Mountain member

Lithology: metasedimentary rock; schist

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 3 % of this area

Silurian Smalls Falls Formation

Lithology: shale; sandstone; calc-silicate rock

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

Silurian Rangeley Formation "B" member"

Lithology: conglomerate; sandstone; shale

Carboniferous alkali feldspar granite (muscovite accessory mineral) (Carboniferous) at surface, covers 17 % of this area

Carboniferous alkali feldspar granite (muscovite accessory mineral) - muscovite-biotite granite

Lithology: granite

Ammonoosuc Volcanics, Metabasalt (Middle - Upper Ordovician) at surface, covers < 0.1 % of this area

Ammonoosuc Volcanics, Metabasalt.

Lithology: meta-basalt

Devonian quartz monzodiorite - quartz diorite (pyroxene plus hornblende accessory mineral) (Devonian) at surface, covers 3 % of this area

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

Lithology: quartz monzodiorite; quartz diorite

Mesozoic alkali feldspar syenite (Mesozoic) at surface, covers < 0.1 % of this area

Mesozoic alkali feldspar syenite - Mesozoic alkali feldspar-biotite syenite

Lithology: alkali syenite

Silurian Smalls Falls Formation? (Silurian) at surface, covers 0.4 % of this area

Silurian Smalls Falls Formation?

Lithology: shale; sandstone; calc-silicate rock

Littleton Formation, undivided (Lower Devonian; Siegenian) at surface, covers < 0.1 % of this area

Littleton Formation undivided - Gray metapelite and metawacke and subordinate metavolcanic rocks; generally, but not everywhere, conformable with underlying Fitch or Madrid Formations. Fossiliferous in western New Hampshire.

Lithology: metasedimentary rock; metavolcanic rock

Ammonoosuc Volcanics, Bimodal volcanic rocks (Middle - Upper Ordovician) at surface, covers < 0.1 % of this area

Ammonoosuc Volcanics, Bimodal volcanic rocks - Locally includes unmapped Oals.

Lithology: bimodal suite

Devonian - Silurian Rindgemere Formation lower member sulfidic pelite (Devonian - Silurian) at surface, covers 0.3 % of this area

Devonian - Silurian Rindgemere Formation lower member sulfidic pelite

Lithology: mudstone

Smalls Falls Formation, undivided (Upper to Middle Silurian (Ludlovian and Wenlockian)) at surface, covers < 0.1 % of this area

Smalls Falls Formation, undivided -Very rusty weathering, thinly bedded sulfidic-graphitic schist and pyrrhotitic calc-silicate granofels. Eastern facies equivalent to lower part of the Fitch Formation. Locally mapped as Francestown Formation of Nielson (1981) in southern New Hampshire.

Lithology: schist; granofels

Silurian Sangerville Formation Anasagunticook member limestone (Silurian) at surface, covers 0.8 % of this area

Silurian Sangerville Formation Anasagunticook member limestone

Lithology: marble

Rangeley Formation, undivided (Lower Silurian (Llandoverian)) at surface, covers < 0.1 % of this area

Rangeley Formation, undivided.

Lithology: metasedimentary rock; calc-silicate rock; meta-argillite; quartzite; pelitic schist; granofels; felsic metavolcanic rock

Silurian Rangeley formation (Silurian) at surface, covers 2 % of this area

Silurian Rangeley formation

Lithology: mudstone; sandstone

Ordovician - Cambrian Dead River formation upper member (Ordovician - Cambrian) at surface, covers 0.4 % of this area

Ordovician - Cambrian Dead River formation upper member

Lithology: phyllite; quartzite

Ordovician Quimby formation (Ordovician) at surface, covers 0.2 % of this area

Ordovician Quimby formation

Lithology: shale; graywacke; felsic volcanic rock

Cambrian Jim Pond Formation graywacke (Cambrian) at surface, covers 1 % of this area

Cambrian Jim Pond Formation graywacke

Lithology: graywacke

Ordovician Ammonoosuc Volcanics (Ordovician) at surface, covers 1 % of this area

Ordovician Ammonoosuc Volcanics

Lithology: mafic volcanic rock; felsic volcanic rock; metasedimentary rock

Biotite quartz diorite in northeastern New Hampshire (Early - Late Devonian) at surface, covers < 0.1 % of this area

Biotite quartz diorite in northeastern New Hampshire

Lithology: quartz diorite

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

Ordovician granite - Ordovician biotite granite

Lithology: granite

Devonian Littleton Formation (Devonian) at surface, covers 5 % of this area

Devonian Littleton Formation

Lithology: schist; metasedimentary rock; gneiss

Silurian unnamed limestone (Silurian) at surface, covers 0.1 % of this area

Silurian unnamed limestone

Lithology: limestone; dolostone (dolomite)

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

Devonian tonalite - biotite tonalite

Lithology: tonalite

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

Devonian Seboomook Formation

Lithology: mudstone; sandstone

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

Ordovician - Cambrian Dead River formation (Ordovician - Cambrian) at surface, covers 1 % of this area

Ordovician - Cambrian Dead River formation

Lithology: slate; quartzite; phyllite

Devonian granite (muscovite accessory mineral) (Devonian) at surface, covers 6 % of this area

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

Lithology: granite

Silurian Rangeley Formation "C" member (Silurian) at surface, covers 0.3 % of this area

Silurian Rangeley Formation "C" member

Lithology: sandstone; conglomerate; shale; limestone

Two-mica granite of the Sebago batholith and Effingham pluton of eastern New Hampshire (Mississippian - Pennsylvanian) at surface, covers < 0.1 % of this area

Two-mica granite of the Sebago batholith and Effingham pluton of eastern New Hampshire.

Lithology: granite

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

Devonian granite - biotite granite

Lithology: granite

Silurian Sangerville Formation Patch Mountain member (Silurian) at surface, covers 2 % of this area

Silurian Sangerville Formation Patch Mountain member

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

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

Devonian Carrabassett Formation (uncertain)

Lithology: amphibolite

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

Ordovician unnamed mafic volcanic rocks

Lithology: mafic volcanic rock

Devonian gabbro - ultramafic rocks (Devonian) at surface, covers < 0.1 % of this area

Devonian gabbro - ultramafic rocks

Lithology: gabbro; ultramafic intrusive rock

Mesozoic mafic to felsic volcanic rocks (Mesozoic) at surface, covers < 0.1 % of this area

Mesozoic mafic to felsic volcanic rocks

Lithology: mafic volcanic rock; felsic volcanic rock

Devonian - Silurian Madrid Formation (Devonian - Silurian) at surface, covers 2 % of this area

Devonian - Silurian Madrid Formation

Lithology: quartzite; calc-silicate rock

Jurassic granite (Jurassic) at surface, covers < 0.1 % of this area

Jurassic granite - Jurassic biotite granite undivided

Lithology: granite

Cretaceous alkali feldspar quartz syenite (Cretaceous) at surface, covers < 0.1 % of this area

Cretaceous alkali feldspar quartz syenite - Cretaceous alkali feldspar-biotite quartz syenite

Lithology: quartz syenite

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

Devonian Ironbound Mountain Formation

Lithology: slate

Devonian granodiorite (muscovite accessory mineral) (Devonian) at surface, covers 0.9 % of this area

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

Lithology: granodiorite

Ordovician Kamankeag Formation pelite member (Ordovician) at surface, covers 0.1 % of this area

Ordovician Kamankeag Formation pelite member

Lithology: mudstone

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

Migmatitic rocks - Formations unidentifiable owing to obliteration of original sedimentary or volcanic characteristics by anatexis or by numerous intrusions.

Lithology: migmatite

Mesozoic foid-bearing syenite (Mesozoic) at surface, covers 0.2 % of this area

Mesozoic foid-bearing syenite - Mesozoic biotite foid-bearing syenite

Lithology: syenite

Precambrian gneisses of the Chain Lakes Massif (Precambrian) at surface, covers < 0.1 % of this area

Precambrian gneisses of the Chain Lakes Massif

Lithology: felsic gneiss

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

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

Devonian Hildreths Formation

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

Ordovician - Cambrian Dead River formation lower member (Ordovician - Cambrian) at surface, covers 4 % of this area

Ordovician - Cambrian Dead River formation lower member

Lithology: quartzite; phyllite

Devonian - Silurian Rindgemere Formation upper member (Devonian - Silurian) at surface, covers 2 % of this area

Devonian - Silurian Rindgemere Formation upper member

Lithology: mudstone; sandstone

Devonian Seboomook Formation Temple Stream member (Silurian-Devonian) at surface, covers 1 % of this area

Devonian Seboomook Formation Temple Stream member

Lithology: schist; metasedimentary rock; conglomerate

Cambrian Hurricane Mountain Formation (Cambrian) at surface, covers 2 % of this area

Cambrian Hurricane Mountain Formation

Lithology: melange

Madrid Formation (Upper Silurian? ) at surface, covers < 0.1 % of this area

Madrid Formation - Massive to weakly foliated, purple biotite-feldspar granofels, layered calc-silicate, and dark pelitic-sulfidic schist containing calc-silicate pods in upper member; an eastern facies equivalent to the upper part of the Fitch Formation. Locally mapped as the Warner Formation of Nielson (1981) in southern New Hampshire.

Lithology: granofels; calc-silicate schist; pelitic schist

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

Silurian Rangeley Formation "A" member

Lithology: shale; sandstone; conglomerate

Devonian Carrabassett Formation (Devonian) at surface, covers 4 % of this area

Devonian Carrabassett Formation

Lithology: schist; metasedimentary rock; gneiss

Devonian Seboomook Formation Mount Blue member (Devonian) at surface, covers 0.8 % of this area

Devonian Seboomook Formation Mount Blue member

Lithology: schist; metasedimentary rock

Devonian granite (muscovite accessory mineral), tonalite (Devonian) at surface, covers 4 % of this area

Devonian granite (muscovite accessory mineral), tonalite

Lithology: granite; tonalite

Cretaceous mafic to felsic volcanic rocks (Cretaceous) at surface, covers < 0.1 % of this area

Cretaceous mafic to felsic volcanic rocks

Lithology: mafic volcanic rock; felsic volcanic rock

Cretaceous alkali feldspar syenite (Cretaceous) at surface, covers < 0.1 % of this area

Cretaceous alkali feldspar syenite - Cretaceous alkali feldspar-biotite syenite

Lithology: alkali syenite