Publisher's Synopsis
Excerpt from The Petrography and Genesis of the Sediments of the Upper Cretaceous of Maryland: A Dissertation to the Board of University Studies of the Johns Hopkins University in Conformity With the Requirements for the Degree of Degree of Doctor of Philosophy
With the light portion there is separated an abundance of grains of a translucent to opaque, humus-brown substance full of small dark granules. The substance is isotropic, index of refraction 155-156. It crushes plastically under the knife. Probably it is a combination of organic and inorganic colloidal matter, with inclusions of granules that may be both mineral and carbonaceous but are not fresh mineral grains.
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