Pennsylvanian cycles in Pennsylvania
By: [by] George H. Ashley
Series: Illinois. State geological survey. Excerpt from Bulletin 60; papers presented at the Quarter Centennial Celebration, p.241-245, 1931
Published: 1931
Place of publication: [Urbana, Ill.]
Language: eng
Number of pages: 245
Subjects: Sedimentation and deposition; Stratigraphic Geology; Geology