This paper is the concluding number of three articles on the Hamilton group of Pennsylvania, which the author has read at successive meetings of the Paleontological Society. In 1932 the first paper, prepared jointly with Arthur B. Cleaves,1 was given. It covered the eastern part of the State from the Delaware Valley to the Susquehanna Valley and also included observations on, and correlations of, the Hamilton of the Green Pond Mountain region, New Jersey. In 1933 the author read the second article of the series,2 which described the group in central Pennsylvania from the Susquehanna Valley west into Fulton and eastern Huntingdon counties. The present article covers the remaining portion of the State where rocks of Hamilton age are known at the surface. It will be necessary first to review previous observations before taking up the new region.

The four formations of the Hamilton group of eastern Pennsylvania are . . .

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