Cannonball Formation

Olive-brown sand, shale, and sandstone; marine shoreline and offshore sediment; as thick as 120 metres (400 feet).
State North Dakota
Name Cannonball Formation
Geologic age Paleocene
Lithologic constituents
Sedimentary > Clastic > Mudstone > Shale (Bed)poorly consolidated
Sedimentary > Clastic > Sandstone (Bed)poorly consolidated
Comments Map unit descriptions mix unconsolidated and sedimentary terms; using sedimentary terms with poorly consolidated according to other sources.

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.

Clausen, E. N., and Kihm, A. J., eds., 1986, Tertiary and Upper Cretaceous of south-central and western North Dakota Field Trip Guidebook, North Dakota Geological Society.

NGMDB product
Counties Adams - Bottineau - Bowman - Burke - Burleigh - Divide - Grant - Kidder - McHenry - McLean - Mercer - Morton - Oliver - Renville - Rolette - Sheridan - Sioux - Ward - Wells