Geologic units in York county, Maine

Devonian - Silurian Rindgemere Formation lower member (Devonian - Silurian) at surface, covers 29 % of this area

Devonian - Silurian Rindgemere Formation lower member

Silurian - Precambrian Z Kittery Formation (Silurian - Precambrian Z) at surface, covers 10 % of this area

Silurian - Precambrian Z Kittery Formation

Silurian - Precambrian Z Berwick Formation (Silurian - Precambrian Z) at surface, covers 9 % of this area

Silurian - Precambrian Z Berwick Formation

Carboniferous granite (muscovite accessory mineral) (Carboniferous) at surface, covers 8 % of this area

Muscovite-biotite granite undivided

Silurian - Ordovician Vassalboro Formation (Silurian - Ordovician) at surface, covers 8 % of this area

Silurian - Ordovician Vassalboro formation

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

Devonian granite

Devonian - Silurian Rindgemere Formation upper member (Devonian - Silurian) at surface, covers 4 % of this area

Devonian - Silurian Rindgemere Formation upper member

Carboniferous granite undivided (Carboniferous) at surface, covers 4 % of this area

Biotite granite

Ordovician - Precambrian Z Cape Elizabeth Formation (Ordovician - Precambrian Z) at surface, covers 2 % of this area

Ordovician - Precambrian Z Cape Elizabeth Formation

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

Biotite granodiorite

Silurian - Precambrian Z Eliot Formation (Silurian - Precambrian Z) at surface, covers 2 % of this area

Silurian - Precambrian Z Eliot Formation

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

Devonian - Silurian Rindgemere Formation lower member limestone

Cretaceous alkali feldspar granite (Cretaceous) at surface, covers 1 % of this area

Cretaceous alkali feldspar-biotite granite

Devonian granite (muscovite accessory mineral) (Devonian) at surface, covers 1 % of this area

Muscovite-biotite granite undivided

Devonian - Silurian Towow Formation (Devonian - Silurian) at surface, covers 1 % of this area

Devonian - Silurian Towow Formation

Devonian - Silurian Rindgemere Formation lower member, sulfidic pelite (Devonian - Silurian) at surface, covers 1 % of this area

Devonian - Silurian Rindgemere Formation lower member sulfidic pelite

Carboniferous gabbro/diorite/ultramafic rocks (Carboniferous) at surface, covers 1 % of this area

Carboniferous gabbro/diorite/ultramafic rocks undivided

Cretaceous alkali feldspar quartz syenite (Cretaceous) at surface, covers 1 % of this area

Cretaceous alkali feldspar-biotite quartz syenite

Devonian - Precambrian Z Gonic Formation (Devonian - Precambrian Z) at surface, covers 0.9 % of this area

Devonian - Precambrian Z Gonic Formation

Cretaceous alkali feldspar syenite (Cretaceous) at surface, covers 0.7 % of this area

Cretaceous alkali feldspar-biotite syenite

Ordovician - Precambrian Z Scarboro and Diamond Island formations (Ordovician - Precambrian Z) at surface, covers 0.6 % of this area

Ordovician - Precambrian Z Scarboro and Diamond Island formations

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

Silurian Waterville Formation

Cretaceous granite (Cretaceous) at surface, covers 0.5 % of this area

Cretaceous biotite granite

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

Cretaceous gabbro/diorite/ultramafic rocks

Mesozoic granite (hornblende accessory mineral) (Mesozoic) at surface, covers 0.3 % of this area

Mesozoic hornblende-biotite granite undivided

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

Devonian - Silurian Towow Formation conglomerate

Cretaceous monzodiorite (Cretaceous) at surface, covers 0.2 % of this area

Cretaceous biotite monzodiorite

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

Silurian Waterville Formation limestone member

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

Cretaceous biotite quartz diorite and gabbro/diorite/ultramafic rocks

Precambrian Z Rye Formation (Precambrian) at surface, covers 0.1 % of this area

Precambrian Z Rye Formation

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

Mesozoic alkali feldspar-biotite syenite

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

Silurian - Ordovician Vassalboro Formation volcanic rocks

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

Cretaceous biotite quartz monzodiorite

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.

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

Gray, thinly laminated (5-25 mm) metapelite with local lentils of turbidites and thin quartz conglomerates in western New Hampshire. Sparse calc-silicate pods and coticule. Probably equivalent to member B of Rangeley Formation of Maine.

Merrimack Group, Eliot Formation (Ordovician? - Silurian?) at surface, covers < 0.1 % of this area

Gray to green phyllite, calcareous quartzite, quartz-mica schist, and well-bedded calc-silicate.

Merrimack Group, Berwick Formation (Ordovician? - Silurian?) at surface, covers < 0.1 % of this area

Purple biotite-quartz-feldspar granofels or schist and interbeds of calc-silicate granofels and minor metapelites. Stratigraphic sequence with respect to Eliot Formation uncertain

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

Rusty-weathering, pelitic schist, metasandstone, and local coarse-grained metasandstone lentils; calc-silicate pods common; minor coticule. Probably equivalent to member C of Rangeley Formation of Maine.

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

Mesozoic gabbro/diorite/ultramafic rocks

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

Mesozoic mafic to felsic volcanic rocks

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

Devonian gabbro/diorite/ultramafic rocks

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

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

Carboniferous alkali feldspar granite (muscovite accessory mineral) (Carboniferous) at surface, covers < 0.1 % of this area

Muscovite-biotite granite

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

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

Cretaceous intrusive breccia (Cretaceous) at surface, covers < 0.1 % of this area

Cretaceous intrusive breccia

Merrimack Group, Kittery Formation (Ordovician? - Silurian?) at surface, covers < 0.1 % of this area

Tan, graded-bedded, calcareous metasandstone and purple and green phyllite. Grades into the Eliot formation but facing direction is uncertain.

Two-mica granite of northern and southeastern New Hampshire (Early - Late Devonian) at surface, covers < 0.1 % of this area

Similar to Concord Granite.

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

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.

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

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.

Concord Granite (Late Devonian) at surface, covers < 0.1 % of this area

Gray two-mica granite, locally grading to tonalite.