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Ludlow Formation

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Grayish-brown and yellowish-brown silt, sand, clay, sandstone, and lignite; river, lake, and swamp sediment; as thick as 100 metres (300 feet).
State North Dakota
Name Ludlow Formation
Geologic age Paleocene
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)poorly consolidated
Sedimentary > Clastic > Sandstone (Bed)poorly consolidated
Sedimentary > Clastic > Mudstone > Claystone (Bed)poorly consolidated
Incidental
Sedimentary > Coal > Lignite (Bed)
Comments Map unit descriptions mix unconsolidated and sedimentary terms; using sedimentary terms with poorly consolidated according to other sources.
References

North Dakota Geological Survey, 2001, Geologic Bedrock Map of North Dakota based on Bluemle, John P., 1983, Geologic and Topographic Bedrock Map of North Dakota, NDGS Miscellaneous Map 25, 1:670,000 scale.

USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/

https://ngmdb.usgs.gov/Geolex/search
NGMDB product
Counties Adams - Bowman - Golden Valley - Slope