Geologic units in Franklin county, Maine

Precambrian gneisses of the Chain Lakes Massif (Precambrian) at surface, covers 11 % of this area

Precambrian gneisses of the Chain Lakes Massif

Devonian granodiorite (muscovite accessory mineral) (Devonian) at surface, covers 8 % of this area

Muscovite-biotite granodiorite

Devonian Seboomook Formation Day Mountain member (Devonian) at surface, covers 5 % of this area

Devonian Seboomook Formation Day Mountain member

Devonian - Silurian Madrid Formation (Devonian - Silurian) at surface, covers 5 % of this area

Devonian - Silurian Madrid Formation

Devonian gabbro/diorite/ultramafic rocks (Devonian) at surface, covers 5 % of this area

Devonian gabbro/diorite/ultramafic rocks

Devonian Seboomook Formation Temple Stream member (Silurian-Devonian) at surface, covers 4 % of this area

Devonian Seboomook Formation Temple Stream member

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

Ordovician Quimby formation

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

Muscovite-biotite granite undivided

Silurian Perry Mountain Formation (Silurian) at surface, covers 3 % of this area

Silurian Perry Mountain formation

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

Devonian granite

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

Devonian Carrabassett Formation massive pelite member

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

Silurian Sangerville Formation

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

Devonian Carrabassett Formation

Devonian gabbro - ultramafic rocks (Devonian) at surface, covers 3 % of this area

Devonian gabbro - ultramafic rocks

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

Silurian Rangeley formation

Silurian Smalls Falls Formation (Silurian) at surface, covers 2 % of this area

Silurian Smalls Falls Formation

Silurian Rangeley Formation, "B" member (Silurian) at surface, covers 2 % of this area

Silurian Rangeley Formation ""B"" member""

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

Silurian Sangerville Formation Anasagunticook member

Ordovician - Cambrian Dead River Formation, lower member (Ordovician - Cambrian) at surface, covers 2 % of this area

Ordovician - Cambrian Dead River formation lower member

Devonian Seboomook Formation Mount Blue member (Devonian) at surface, covers 2 % of this area

Devonian Seboomook Formation Mount Blue member

Cambrian Jim Pond Formation, graywacke (Cambrian) at surface, covers 2 % of this area

Cambrian Jim Pond Formation graywacke

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

Muscovite-biotite granite

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

Devonian Hildreths Formation

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

Cambrian Hurricane Mountain Formation

Devonian Carrabassett Formation, thinly layered member (Devonian) at surface, covers 1 % of this area

Devonian Carrabassett Formation thinly layered member

Silurian Rangeley Formation, "A" member lithic sandstone" (Silurian) at surface, covers 1 % of this area

Silurian Rangeley Formation ""A"" member lithic sandstone

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

Hornblende-biotite granodiorite

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

Silurian Greenvale Cove Formation

Ordovician - Cambrian Dead River Formation, upper member (Ordovician - Cambrian) at surface, covers 0.9 % of this area

Ordovician - Cambrian Dead River formation upper member

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

Devonian Seboomook Formation

Silurian Rangeley Formation, "C" member (Silurian) at surface, covers 0.8 % of this area

Silurian Rangeley Formation ""C"" member

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

Devonian Ironbound Mountain Formation

Cambrian Jim Pond Formation, quartzwacke and pelite (Cambrian) at surface, covers 0.7 % of this area

Cambrian Jim Pond Formation, quartzwacke and pelite

Ordovician granodiorite (Ordovician) at surface, covers 0.6 % of this area

Ordovician biotite granodiorite

Silurian Sangerville Formation, Patch Mountain member (Silurian) at surface, covers 0.5 % of this area

Silurian Sangerville Formation Patch Mountain member

Ordovician Kamankeag Formation, basalt and graywacke member (Ordovician) at surface, covers 0.5 % of this area

Ordovician Kamankeag Formation basalt and graywacke member

Cambrian Jim Pond Formation (Cambrian) at surface, covers 0.5 % of this area

Cambrian Jim Pond Formation

Cambrian gabbro/diorite/ultramafic rocks (Cambrian) at surface, covers 0.5 % of this area

Cambrian gabbro/diorite/ultramafic rocks

Ordovician Kamankeag Formation, pelite member (Ordovician) at surface, covers 0.5 % of this area

Ordovician Kamankeag Formation pelite member

Cambrian quartz diorite (Cambrian) at surface, covers 0.4 % of this area

Cambrian biotite quartz diorite

Devonian granodiorite - quartz syenite (porphyritic texture) (Devonian) at surface, covers 0.4 % of this area

Devonian porphyritic biotite granodiorite to quartz syenite - porphyritic biotite granodiorite, porphyritic biotite tonalite, porphyritic alkali feldspar-biotite quartz syenite, and porphyritic biotite quartz syenite.

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

Cambrian Jim Pond Formation mafic volcanic rocks

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

Silurian - Ordovician unnamed pelite

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

Silurian Sangerville Formation Anasagunticook member limestone

Cambrian ultramafic rocks (Cambrian) at surface, covers 0.2 % of this area

Cambrian ultramafic rocks

Ordovician Quimby Formation, pelite member (Ordovician) at surface, covers 0.2 % of this area

Ordovician Quimby formation pelite member

Silurian Rangeley Formation, "A""member (Silurian) at surface, covers 0.2 % of this area

Silurian Rangeley Formation ""A"" member

Devonian Seboomook Formation Day Mountain member, limestone (Devonian) at surface, covers 0.2 % of this area

Devonian Seboomook Formation Day Mountain member limestone

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

Silurian Sangerville Formation limestone member

Cambrian Jim Pond Formation, felsic volcanic rocks (Cambrian) at surface, covers 0.2 % of this area

Volcanic and metasedimentary rocks of the ophiolite sequence in central-western Maine are here named the Jim Pond Formation. It consists of a basal chlorite-albite-epidote-actinolite greenstone member with minor metagraywacke, 150 to 500 m thick. Northwest of the Squirtgun fault it is divided into lower and upper units by a metadacite member in the east, 0 to >500 m thick, and a metagraywacke member in the west. The metadacite member is closely associated with hematitic chert iron-formation members. Greenstone is thickly layered with pillowed and massive flows. Patches of altered amphibolite are in contact with the southeastern belt of tonalite of the Boil Mountain Complex. (ME075) Unit description from USGS GEOLEX website (ME078).

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

Silurian Hardwood Mountain Formation

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

Devonian Carrabassett Formation quartzite member

Devonian Seboomook Formation Day Mountain member, conglomerate (Devonian) at surface, covers 0.1 % of this area

Devonian Seboomook Formation Day Mountain member conglomerate

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

Biotite granite undivided

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

Ordovician biotite granite

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

Ordovician Quimby formation graywacke member

Cambrian Jim Pond Formation, siltstone, mudstone, and pelite (Cambrian) at surface, covers < 0.1 % of this area

Cambrian Jim Pond Formation siltstone, mudstone, and pelite

Devonian granite-quartz diorite (Devonian) at surface, covers < 0.1 % of this area

Biotite granite, biotite granodiorite, biotite tonalite, biotite quartz syenite, biotite quartz monzodiorite, and biotite quartz diorite.

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

Silurian - Ordovician unnamed sedimentary rocks

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

Biotite granite

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

Ordovician - Cambrian Dead River formation

Ordovician Quimby Formation, rhyolitic volcanic member (Ordovician) at surface, covers < 0.1 % of this area

Ordovician Quimby formation rhyolitic volcanic member

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

Devonian - Ordovician unnamed pelite