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Skunnemunk Conglomerate (NJDsk;6)

Geologic Formation near West Milford, NJ

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Lithology

Chert

Quartzite

Chert

Other (41 mi²)

Geologic Age

Middle Devonian (394.5 Ma – 384.3 Ma ago)

Geologic Unit Label

Dsk

(Darton, 1894) - Grayish-purple to grayish-red, thin- to very thick bedded, locally cross-bedded, polymictic conglomerate and sandstone containing clasts of white vein quartz, red and green quartzite and sandstone, red and gray chert, and red shale; interbedded with medium-gray, thin-bedded sandstone and greenish-gray and grayish-red, mud-cracked shale. Conglomerate and sandstone matrix is primarily hematite and microcrystalline quartz. Conglomerate cobbles range to 16.5 cm (6.5 in) long, and average cobble size increases in upper part of unit. Lower contact conformable and gradational as defined by Kummel and Weller (1902). About 915 m (3,000 ft) thick.

— USGS

Taxonomy

Classified As

Geologic Formation