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The
Florissant Formation: A Virtual Tour
Upper Shale Unit |
 Upper Shale Unit with Upper Pumice Conglomerate |
The Upper Shale Unit The upper shale unit follows the caprock conglomerate and represents lacustrine or lake deposition after the lahar entered the lake. In the northwest corner of the monument the upper shale unit overlies the middle shale unit. Like the middle shale unit, the upper shale unit consists of alternating paper shales and pumice conglomerate beds. Fossils of plants, insects, fish scales and ostracods are found within this unit. The upper shale unit is different from the middle shale unit in its abundance of ostracodes and fingernail clam shells (Evanoff, McIntosh, and Murphey, 2001, p. 11). The upper shale unit is exposed along Boulder Creek. |
 Upper Shale Unit and Pumice Conglomerate |
Bibliography |
| Evanoff, E., McIntosh, W.C. and Murphey, P.C. (2001). Stratigraphic Summary and 40Ar/39Ar Geocrhonology of the Florissant Formation, Colorado. In Evanoff, E., Gregory-Wodzicki K.M. and Johnson, K.R. [Eds.] Fossil Flora and Stratigraphy of the Florissant Formation, Colorado. (pp. 1-16). Proceedings of the Denver Museum of Nature and Science, series 4, number 1. |