Geologic units in Carroll county, New Hampshire

Two-mica granite of the Sebago batholith and Effingham pluton of eastern New Hampshire (Mississippian - Pennsylvanian) at surface, covers 20 % of this area

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

Winnipesaukee Tonalite (Early Devonian) at surface, covers 17 % of this area

(Winnipesaukee Quartz Diorite of Billings, 1955) - Gray, massive to foliated tonalite and minor quartz diorite, granodiorite, and granite. Probably coeval with Spaulding Tonalite.

Conway Granite (Middle - Late? Jurassic) at surface, covers 11 % of this area

Typically pink, coarse-grained mesoperthitic biotite (amphibole-free) granite; locally fine-grained or porphyritic.

Littleton Formation, undivided (Lower Devonian; Siegenian) at surface, covers 9 % 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.

Mount Osceola Granite, Granite containing hornblende and, locally, hastingsite, ferrohedenbergite, or fayalite (Early - Middle Jurassic) at surface, covers 8 % of this area

Mount Osceola Granite, Granite containing hornblende and, locally, hastingsite, ferrohedenbergite, or fayalite.

Perry Mountain and Rangeley Formations, undivided (Silurian) at surface, covers 4 % of this area

Perry Mountain and Rangeley Formations, undivided.

Mesoperthitic biotite granite (Early Cretaceous) at surface, covers 4 % of this area

Pink Conway-type granite of Kingsley (1931).

Lower part of Rangeley Formation (Lower Silurian (Llandoverian)) at surface, covers 3 % 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.

Kinsman Granodiorite (Early Devonian) at surface, covers 3 % of this area

(Kinsman Quartz Monzonite of Billings, 1955) - Foliated granite, granodiorite, tonalite, and minor quartz diorite; large megacrysts of potassium feldspar characteristic; garnet locally abundant.

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

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

Porphyritic hornblende or alkalic amphibole quartz syenite (Jurassic) at surface, covers 2 % of this area

Porphyritic hornblende or alkalic amphibole quartz syenite.

Rhyolite and fine-grained granite (Cretaceous) at surface, covers 2 % of this area

Includes some ignimbritic caldera-fill and minor intrusive rocks (part of Ossipee Mountain Complex of Kingsley, 1931); also some aphanitic gray, black, or tan quartz-feldspar porphyry.

Rangeley Formation, undivided (Lower Silurian (Llandoverian)) at surface, covers 2 % of this area

Rangeley Formation, undivided.

Moat Volcanics (Middle Jurassic?) at surface, covers 1 % of this area

Bedded and ignimbritic tuffs, flows, and breccias; also porphyritic rhyolite and minor trachyte.

Smalls Falls Formation, undivided (Upper to Middle Silurian (Ludlovian and Wenlockian)) at surface, covers 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.

Trondhjemite and abundant pegmatite (Devonian - Mississippian) at surface, covers 1 % of this area

Gray and fine-grained; possibly belonging to the Sebago batholith.

Rangeley Formation, Ribbon-banded calc-silicate of eastern New Hampshire (Lower Silurian (Llandoverian)) at surface, covers 1 % of this area

Probably equivalent to Patch Mountain Member of the Sangerville Formation (Llandoverian and Wenlockian) of central Maine.

Hornblende or alkalic amphibole quartz syenite (Jurassic) at surface, covers 1 % of this area

Hornblende or alkalic amphibole quartz syenite.

Madrid and Smalls Falls Formations, undivided (Silurian) at surface, covers 1 % of this area

Madrid and Smalls Falls Formations, undivided.

Madrid Formation (Upper Silurian?) at surface, covers 1.0 % 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.

Large mesoperthitic phenocrysts in a pink to gray quartz syenite porphyry of ""Albany type"" (Cretaceous) at surface, covers 0.9 % of this area

Alkalic amphibole or fayalite may be present. Part of Ossipee Mountain Complex of Kingsley (1931).

Perry Mountain Formation, undivided (Lower? - Middle? Silurian) at surface, covers 0.9 % of this area

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

Basalt (Cretaceous) at surface, covers 0.8 % of this area

Black, chiefly massive to porphyritic. Includes minor rhyolitic ignimbrite and andesitic tuff. Part of Ossipee Mountain Complex of Kingsley (1931)

Mount Osceola Granite, Green biotite mesoperthitic granite (Early - Middle Jurassic) at surface, covers 0.8 % of this area

Mount Osceola Granite, Green biotite mesoperthitic granite.

Upper part of Rangeley Formation (Lower Silurian (Llandoverian)) at surface, covers 0.7 % 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.

Granite porphyry (Early Jurassic) at surface, covers 0.6 % of this area

Granite containing phenocrysts of smoky quartz and microperthite; alkalic amphibole, hornblende, and hedenbergite or fayalite may be present. "Mount Lafayette" type granite porphyry of Billings (1955).

Porphyritic syenite (Jurassic) at surface, covers 0.5 % of this area

Hastingsite or hornblende and (or) hedenbergite are present.

Nepheline-sodalite-hastingsite syenite (Jurassic) at surface, covers 0.3 % of this area

Found at Red Hill in Mt. Chocorua quadrangle (see index accompanying ""Sources of Map Data"").

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

Contains riebeckite and (or) hastingsite.

Two-mica granite of northern and southeastern New Hampshire (Early - Late Devonian) at surface, covers 0.2 % of this area

Similar to Concord Granite.

Hornblende (or alkalic amphibole) syenite (Jurassic) at surface, covers 0.2 % of this area

Hornblende (or alkalic amphibole) syenite.

Augite-hornblende-biotite gabbro (Cretaceous) at surface, covers < 0.1 % of this area

Fine- to coarse-grained.

Devonian - Silurian Rindgemere Formation lower member (Devonian - Silurian) at surface, covers < 0.1 % of this area

Devonian - Silurian Rindgemere Formation lower member

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

Devonian granite

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

Porphyritic granite.

Medium-grained mesoperthitic granite containing riebeckite and (or) hastingsite (Cretaceous) at surface, covers < 0.1 % of this area

Medium-grained mesoperthitic granite containing riebeckite and (or) hastingsite.

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

Commonly porphyritic and mesoperthitic; contains biotite and, locally, fayalite, hastingsite, hornblende, or ferrohedenbergite.

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

Leucocratic, pink or light-brown, and mesoperthitic.

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

Biotite granodiorite

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

Jurassic granite - Jurassic biotite granite undivided

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

Muscovite-biotite granite

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

Gray two-mica granite, locally grading to tonalite.

Porphyritic biotite granite (Cretaceous) at surface, covers < 0.1 % of this area

Pink to gray; hastingsite or riebeckite in some varieties.

Biotite-hornblende granodiorite (Cretaceous) at surface, covers < 0.1 % of this area

Biotite-hornblende granodiorite.

Devonian - Silurian undifferentiated sedimentary rocks in areas of extreme migmatization (Devonian - Silurian) at surface, covers < 0.1 % of this area

Devonian - Silurian undifferentiated sedimentary rocks in areas of extreme migmatization