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MAP

Topo

Rock Formations

Measure

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Topo

Ecoregions

Public Lands

...

BASEMAPS

Default Weather

Temperature

Smoke

...

WEATHER

Alluvial, coastal and low terrace deposits (ALHalt;0)

Geologic Formation in MS, AL, FL, GA

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Lithology

Peat

Marl

Silt

Other (46,524 mi²)

Geologic Age

Holocene (11700 years ago – 2020)

Geologic Unit Label

Halt

Varicolored fine to coarse quartz sand containing clay lenses and gravel in places. Gravel composed of quartz and chert pebbles and assorted metmorphic and igneous rock fragments in streams near the Piedmont. In areas of the Valley and Ridge province gravel composed of angular to subrounded chert, quartz, and quartzite pebbles. Coastal deposits include fine to medium quartz sand with shell fragments and accessory heavy minerals along Gulf beaches and fine to medium quartz sand, silt, clay, peat, mud and ooze in the Mississippi Sound, Little Lagoon, bays, lakes, streams, and estuaries.

— USGS

Taxonomy

Classified As

Geologic Formation