Supplemental material: Subdivision of Ordovician and Silurian time scale using accumulation rates of graptolitic shale
journal contributionposted on 01.01.1977 by M. Churkin
Any type of content formally published in an academic journal, usually following a peer-review process.
GSA Data Repository Item 7711, Geology, Vol. 5, p. 452. File size: 6 p., about 305 K bytes.