File:Maryland geological survey (1901) (14582474450).jpg

Identifier: marylandgeologic04mary (find matches)
Title: Maryland geological survey
Year: 1901 (1900s)
Authors: Maryland Geological Survey
Subjects: Geology Paleontology Geology, Stratigraphic
Publisher: Baltimore, The Johns Hopkins Press
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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Text Appearing Before Image:
Fig. I.—VIEW showing the patuxent-arundel contact in belt line cut near the EASTERN BOUNDARY OF BALTIMORE CITY.
Text Appearing After Image:
rJ^-iK ^-i. !fi ■ ^fXr^J^ Fig. 2.—VIEW showing erosion of old iron mine in the arundel formation, SCHOOLHOUSE HILL, BALTIMORE COUNTY. Maryland Geological Suevey 69 lignites. Small deposits of pyrite are also found in the same beds. Thevariegated clays which commonly exhibit a great variety of exception-ally rich and delicate tints in irregular patterns often grade hori-zontally into massive drab and black clays, which are often lignitic andoccasionally iron- or leaf-bearing. The sand sometimes contains pelletsor balls of white clay. They are frequently cross-bedded, although notas strongly so as the sands in the Patuxent formation. Red ochre, knownas paint rock or paint stone, occurs near the base and summit,and sometimes within the formation, while flakes of sandy and ocherouslimonite with botryoidal inferior surfaces are not uncommon at certainhorizons. The variegated clays often contain small pieces of flattenedlimonite quite uniform in size. The drab and chocolate-colored clay

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