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Sagenopteris williamsii is an extinct pteridosperm (seed fern) that is known from the late Jurassic and Early Cretaceous strata of the western interior of North America. It was first described as Chiropteris williamsii by J.S. Newberry in 1891, based on specimens from the Great Falls coal field in Montana. In 1956, it was referred to as Sagenopteris by W.A. Bell based on additional specimens from western Canada.
Leaves of S. williamsii have been reported (as Chiropteris williamsii) from the late Jurassic strata of the Morrison Formation in western Montana. In Canada, they are known from the Jurassic Hazelton Group of north-central British Columbia, the Early Cretaceous Blairmore and Luscar Groups of western Alberta, and the Early Cretaceous Bullhead Group of northeastern British Columbia.
Text excerpted from the Wikipedia article Sagenopteris williamsii by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
