Mississippian Bear Gulch Algal Frond Heterokont Fossil

Heterokonophyta indet

Kingdom Chromalveolata, Phylum Heterokontophyta

Geological Time: Mississippian (~320 m.y.a.)

Size (25.4 mm = 1 inch): Fossil is 20 mm long; Matrix: 50 mm by 35 mm and 50 mm by 40 mm pair

Fossil Site: Heath Shale Formation, Bear Gulch Limestone, Fergus County, Montana

Fossil Code: BGF338

Price: $85.00 - sold


Description: The Bear Gulch Limestone is a deposit of some 70 square km in extent and 30 m in depth that has been a source of one of the most diverse assemblages of fossil fish with some 110 species having been described over the past 30 years. Most were new to science, and provided a unique view of the marine environment of Mississippian times. Fine preservation of both fish and invertebrates is a hallmark of these deposits, presumably due to an anoxic depositional environment. This plate shows a frond of an unusual alga which I have been unable to identify so far. It differs from the bladelike strands I have seen in the past (see my other offerings). To my knowledge, no specimen has previously been offered. This is the ONLY one I have ever seen.

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