Excerpt from A Study of the Igneous Rocks at York Haven and Stony Brook, Pa. And Their Accompanying Formations: Thesis, Presented to the Faculty of the Department of Philosophy of the University of Pennsylvania, in Partial Fulfillment of the Requirements for the Degree of Doctor of Ph... ilosophy
York and Adams counties, and refers them all to dolerite, With this exception little if any work has been published in regard to them.
The following investigation was begun with the desire of studying two of these dikes in order to ascertain what points of resemblance or difference they might show with similar regions elsewhere. In addition to this work a study was made of the formations surrounding one of these dikes.
The two localities selected are at York Haven and Stony Brook, both in York county. At the former locality the surrounding rocks are Triassic, at the latter they are Cambrian.
Before proceeding to a. Description of these dikes it may not be amiss to indicate brie¿y the geological structure of the part of York county referred to.
The accompanying map, which is reduced from the State Survey map of York county, will assist in making the geological structure clear.
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