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tables
Critical tables for conversion of K-Ar ages from old to new constants
Introduction to “1968 seismological tables for P phases”
Minutes of meeting of the IMA Commission on Ore Microscopy held in New Delhi on 14th December, 1964
REPLY BY AUTHOR TO DISCUSSION BY STEPHEN THYSSEN-BORNEMISZA AND W. F. STACKLER
Pennsylvanian Geology of a Part of the Southern Appalachian Coal Field
The age and tectonic relationships of east African volcanic rocks
The lower limit of the Pleistocene in Europe and Asia
Ordovician elastic sedimentary rocks in Pennsylvania
On Permian and Triassic tetrapods
Hecla Hoek rocks of New Friesland (Spitsbergen)
The upper Oxford clay at Purton, Wilts, and the zones of the lower Oxfordian
INTRODUCTION The age of the Glenarm series in general and the Wissahickon schist in particular has been under discussion for over 30 years, and in spite of much work done in the areas underlain by this series its age is still left in doubt. Some workers assign it to the pre-Cambrian because of lack of evidence to the contrary, and others hold it to be the equivalent of a metamorphic facies of the Ordovician Martinsburg shale. As an interpretation, the “Martic overthrust” has added a new element to the discussion. Obviously a good store of facts is needed on which all workers can agree and which should help all concerned. The problem involved is fundamental for the interpretation of width and depth of the Appalachian geosyncline, its deformation, the participation of the basement, and the role played by the intrusions. The area reaches roughly from New Jersey to Alabama and accompanies the Appalachians along their southeast side as a belt of “pre-Cambrian” crystalline rocks. This would leave the Appalachians without definite basement and also almost without accompanying intrusions found in other orogenic units like the Caledonians, Variscians, or the Alps. The authors are not particularly interested as to whether the Wissahickon schist is pre-Cambrian or Paleozoic or whether the Martic overthrust does or does not exist. They have tried an application of all modern structural and petrologic methods at their command in a controversial area in which detailed information is lacking, hoping that this may contribute to . . .