. Maryland geological survey. cher, under instructionsfrom Professor 0. C. Marsh, collected a considerable number of verte-brate bones from an iron mine near Muirkirk, Md. He also found inthe same beds some small cones representing the genus Sequoia, andmuch silicified wood and lignite. The bones were described by ProfessorMarsh and the results published at once. As to the geological signifi-cance of these forms, Professor Marsh says: The fossils here described, and others from the same horizon, seem toprove conclusively that the Potomac formation in its typical localitiesin Maryland is of Jur
. Maryland geological survey. cher, under instructionsfrom Professor 0. C. Marsh, collected a considerable number of verte-brate bones from an iron mine near Muirkirk, Md. He also found inthe same beds some small cones representing the genus Sequoia, andmuch silicified wood and lignite. The bones were described by ProfessorMarsh and the results published at once. As to the geological signifi-cance of these forms, Professor Marsh says: The fossils here described, and others from the same horizon, seem toprove conclusively that the Potomac formation in its typical localitiesin Maryland is of Jurassic age, and lacustrine origin. There is evidencethat some of the supposed northern extensions of this formation, even ifof the same age, are of marine or estuary origin.^ The next year Professor Uhler read a paper before the AmericanPhilosophical Society in which the name Baltimorean was proposed forthe lower beds and Albirupean for the upper, which, however, included MARYLAND GEOLOGICAL SURVEY. LOWER CRETACEOUS, PLATE III. Fig. I.—VIEW showing coarse, highly inclined and cross-eedded patlxext saxus NEAR HOMESTEAD, BALTIMORE CITY.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectpaleont, bookyear1901
