Rare Mississippian Bear Gulch Fossil Starfish with Many Legs

Part and Counterpart

Lepidasterella montanensis

Class Stelleroidea, Order Spinulosida, Family Heliathasteridae

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

Size (25.4 mm = 1 inch): Fossil is 60 mm by 100 mm across (Maximum)
Matrix: 120 mm by 150 mm and 160 mm by 170 mm pair

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

Fossil Code: BGF526

Price: Sold

Lepidasterella montanensisDescription: 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 specimen is a fine part/counterpart example of a many-armed starfish called Lepidasterella. At the time of its discovery some 25 years ago it was the only known many-armed starfish known from the time interval ranging from the Upper Devonian to the Lower Jurassic. The closest living relatives are the Sun Stars of the Family Solasteridae which are known as active and voracious predators. Sea Stars are one of the less commonly seen Paleozoic echinoderms, and thus poorly documented from the western United States, making this pair quite unique. Since Asterozoans typically begin to disarticulate soon after death, this one must have been buried quickly to be in such a fine state of preservation. This is an example of incomplete weathering and splitting of the matrix. Someone with the skills of a preparator could probably expose substantially more of the starfish which is sure to be present on the larger positive half.

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