BH250-122
Title
BH250-122
Subject
Limestone within the Decorah Shale
Description
The Decorah Shale directly overlies the Platteville Limestone and consists of fine-grained, greenish-gray shale interbedded with occasional carbonate lenses. The outcrop is rich in articulate brachiopods and bryozoans, disarticulated crinoid, gastropods, bivalves, cephalopods, rugose corals, and trilobites. The photo of this sample shows rugose coral.
Coverage
Near Rochester MN
Creator
Bereket Haileab
Source
From the rock collection of Bereket Haileab. Sample BH250-122. Housed at Carleton College in Minnesota.
Type
Hand sample
Relation
Collection
Citation
Bereket Haileab, “BH250-122,” BH250 Mineralogy Teaching Collection, accessed April 25, 2026, https://bereket-haileab.geology.sites.carleton.edu/items/show/143.