Coleraine Formation (MNKc;0)

Coleraine Formation

Conglomerate, lignite, sandstone, and shale; shallow marine and non-marine. Late Cenomanian age is inferred. Despite exposures in mines on the Mesabi Iron Range, the position of much of the unit contact is highly speculative.

State	Minnesota
Name	Coleraine Formation
Geologic age	Late Cenomanian
Lithologic constituents	Major Sedimentary > Clastic > Conglomerate (Bed) Sedimentary > Coal > Lignite (Bed) Sedimentary > Clastic > Sandstone (Bed) Minor Sedimentary > Clastic > Mudstone > Shale (Bed)
References	Jirsa, Mark A., Boerboom, Terrence J., Chandler, Val W., Mossler, John H., Runkel, Anthony C., and Setterholm, Dale R., 2011, S-21 Geologic Map of Minnesota-Bedrock Geology; Minnesota Geological Survey, State Map Series S-21. Scale 1:500,000.
NGMDB product	NGMDB product page for 96821
Counties	Aitkin - Cass - Crow Wing - Itasca - Saint Louis

Coleraine Formation

Jirsa, Mark A., Boerboom, Terrence J., Chandler, Val W., Mossler, John H., Runkel, Anthony C., and Setterholm, Dale R., 2011, S-21 Geologic Map of Minnesota-Bedrock Geology; Minnesota Geological Survey, State Map Series S-21. Scale 1:500,000.