![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
Abstract
A collection of fossil plants from Jurassic rocks in the Upper Amur basin, U. S. S. R., provides the basis for description of a new genus and two new species of fossil cycads. Butefia, n. gen., is erected to accommodate certain leaf forms previously included within the confused circumscription of the genus Glossozamites. The type species is B. ensiformis (Heer) Dobruslcina, n. comb. (formerly Podozamites ensiformis Heer). Also described are Nilssonia amurensis n. sp. and Nilssonia pseudomediana n. sp. The Nilssonia material is noteworthy, in that several specimens were found that consist of clusters of 3 to 7 radially arranged leaves. — S. H. Mamay.