State by State
- Specimen Number
Irregular slab of strong reddish brown bedded rock with honeycomb structure and white matrix. Identified by survey staff at the University of Iowa as a favosite, an extinct, colonial, tabular coral.
Sedimentary. Limestone. Reef. Coral.
- Location & Occurrence
Marine reef created by extinct form of coral as part of a vast, shallow, epicontinental sea.
- Geological Age
Devonian. 448-251 Ma (Britannica).
Modern reefs are completely different, dominated by scleractinian corals.