Correlation of the Silurian formations of North America

INTRODUCTION This is Number 3 of a series of correlation charts prepared under the auspices of the Committee of Stratigraphy of the National Research Council (Dunbar, 1942, p. 429–434). It was compiled by a subcommittee on the Silurian system. Each member of the subcommittee has furnished, and is responsible for, the correlations suggested in the columns bearing his name and has provided or approved the annotations cited in his columns.[1][1] The correlations of the Silurian deposits of northwestern Greenland with British formations are from the reports of Lauge Koch (1929, p. 237–242) and Chr. Poulsen (1934, p. 44). ANNOTATIONS 1. The Medinan of Vanuxem and Hall was shown by Grabau and others to include, at its base, the Queenston shale of Richmond age, here referred to the Upper Ordovician. Ulrich, Bassler, and the New York Geological Survey use the term in its original sense to include the Queenston . . . [1]: #fn-2