Correlation of the Ordovician Formations of North America

Journal of Research of the U. S. Geological Survey, 1973, volume 1, issue 1

“…The upper age of the Martinsburg in eastern Pennsylvania has generally been given as early Maysvillian (for example, Twenhofel and others, 1954) based on shelly fossils identified by Ulrich (in Stose, 1930, p. 648-649) from the Shochary Ridge area west of Lehigh River. The Shochary Sandstone and what is here called the Ramseyburg Member were originally thought to be contiguous units by Behre (1933).…”

Taconic stratigraphic names: Definitions and synonymies

“…·While these differences are trivial, other ostensibly analogous differences (for instance, the Schodack Shale and Limestone as opposed to the Schodack Formation) may denote entirely different rock groups; hence clarification of each variant is necessary. For the trivial variants, the spellings and designations in the correlation charts for the Cambrian System (Howell and others, 1944) and for the Ordovician System (Twenhofel and others, 1954) have been accepted as the norm and the variants have been included in the synonymy. ··…”

“…Remarks.-There are several variant spellings to the name Deepkill; the one presently adopted is that given in the correlation chart for the Ordovician system by Twenhofel and others ( 1954). The list given is not exhaustive but represents the forms found in the principal source material dealing with the area around the type locality.…”

“…Remarks.-Although the N ormanskill Shale was first named by Ruedemann ( 1901a), the spelling and lithic designation of Clarke was accepted by Twenhofel and others ( 1954). No attempt has been made to search the literature for all the variant spellings and rock designations of this unit, nor for all the names of formations that were, or are, thought to be equivalent to or subdivisions of tlus unit; to do so would require a thorough review of the problem of the N ormanskill as a whole, in all its stratigraphic, structural, and paleontologic ramifications, an undertaking that is beyond the scope of this study.…”

Geological Survey research 1972

“…1) is generally given as late F:denian to early Maysvillian (for example, Twenhofel and others, 1954) on th e basis of an abundant shell y fauna initially identified by Ulrich (in Stose, 1930, p. 648-649). Belm (1933) mapped the rocks in Shochary Ridge as the Martinsburg Formation (chiefly the Ramscyburg Member of fig.…”