Notes on the Cambrian rocks of Pennsylvania and Maryland, from the Susquehanna to the Potomac

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Abstract
THE special study of the Cambrian rocks of the Southern Appalachians* was limited during the past field season to an examination of some of the morc important exposures of the group in central Pennsylvania and Maryland.Within this area between the Susquehanna and the Potomac rivers two points have been the subject of investigation by geologists, and' decided differences of opinion exist in regard to the stratigraphy and the geological age of the rocks embraced within them .. One is that of South Mountain as it occurs in Franklin, Oumberland, York and Adams cOllnties, in Penn• s'ylvania.The second is the area about Harper's Fel'ry, Virginia.After an examination of the published literature, including geological sections and maps, it was decided to begin work. in York county on the Susquehanna and to extend it southwest to the Potomac.PriOi' to this three days were spent at Mount Holly Spdng's, in the northwestern part of S6uth Mountain, in a preliminary examination of the qnal'tzites exposed at that point.The discovery of the lower Cambrian or Olenellus fauna in a synclinal trough Ileal' the western foot of the mountain, gave an important datum point which was aftenvards of great service in work to the south in Franklin county.
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Authors Charles D. Walcott
Journal american journal of science
Year 1892
DOI
10.2475/ajs.s3-44.264.469
URL
https://doi.org/10.2475/ajs.s3-44.264.469
Keywords Keywords not found

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