Robuta

https://scholarshare.temple.edu/entities/publication/0bfdce2c-a994-40d1-b17f-17c6b64fcfb1 Correlation of a Hierarchy of Orbitally Forced Allocycles in the Lower Silurian McKenzie Limestone... The lower part of the McKenzie Member of the Mifflintown Formation (Latest Wenlockian) in Pennsylvania and Maryland occurs as a hierarchically stacked set of...