MR-1994-001-00_lithologic_log

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+ DIVISION OF HIGHWAYS
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FOUNDATION BORING LOG SHEET OF
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NORTH CAROLINA ._QEPARTMENT OF TRANSPORTATION
DIVISION OF .HIGHWAYS -
GEOTECHNICAL UNIT
FOUNDATION BORING LOG SHEET a OF :�
PROJECT NO.�, COUNTY M A2•Ti h1 GEOLOGIC PROVINCE C P
BRIDGE ON ` L " OVER Y7
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COLLAR ELEV. DATE STARTED_! Il A^ DRILL EQUIPMENT C E �S L�
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V pyLEY C
J G OltG'
Clinch Valley College of the University of Virginia
e College Avenue, Wise, Virginia 24293-0016
rt 1954 V~~
TY OF v`¢
Jan. 31, 1995
Dept. Natural Sciences
Bill Hoffman
NC Geology Survey
4100 Reedy Creek Rd.
Raleigh, NC 27607
Dear Bill:
I have examined the 4 core samples from the DOT boring MR-HB-1-94 from Martin
county. The core is already as old as Cretaceous in the first sample (depth 80. I-80.6 ft.).
Although the samples are not rich in Globotruncanid spp., the presence of rare Gc.
gagnebini in samples 3 & 4 (depths 89.1-90.6 ft. and 94.1-95.6ft.) and forms related to
Gc. bulloides are indicative of a middle Maestrichtian age. Other species present in all
four samples which are common to the latest Cretaceous include Globigerinelloides
prairiehillensis, Rugoglobigerina rugosa and Guembelitria cretacea. I see nothing that
would make me think that the samples are as young as late Maestrichtian, and the
presence of Gc. gagnebini should preclude them being as old as early Maestrichtian.
The relative proportions of benthic to planktonic species, the mix of benthic species, the
low diversity of planktonics and the overall small size of the planktonics suggest a middle
shelf environment of deposition, although if the waters were turbid, it may have been a
deeper setting.
I will send the bulk samples back in a separate package, which should arrive shortly. Let
me know if I can be of further help.
Sincerely,
4/ 'J
Robert D. VanGundy

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