Columbus bed defined as sand underlying Marshalltown bed and overlying Woodbury bed. All included in Clay marl series [Matawan group].
Source: GNU records (USGS DDS-6; Reston GNULEX).
Columbus sand described as white or yellow quartz sand marked by delicate lines of red. Thickness 20 to 100 ft. Overlies Woodbury clay and underlies Marshalltown clay marl.
Source: GNU records (USGS DDS-6; Reston GNULEX).
Kummel, H.B., 1907, [footnote]: New Jersey Geological Survey Report on Paleontology, v. 4, p. 17.
The term Columbus as here used has been found to conflict with its prior use in Ohio for a Devonian formation and in this report the term Englishtown sand will be used instead, as the formation is well developed near that place in Monmouth Co., NJ.
Source: GNU records (USGS DDS-6; Reston GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
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