The uppermost Cretaceous and lowermost Tertiary planktonic Foraminifera obtained from cores taken in a deep well near Dover, Delaware are studied. The Cretaceous foraminifers are of the Heterohelix-Globotruncana assemblage and are probably of late Maescrichtian age. The Danian Globorotalia compressa - Globigerinoides daubjergensis zone lies immediately above. The Cretaceous-Tertiary boundary is at a depth of approximately
980 feet and lies within a gray, glauconitic silt.
Please give proper credit to the Delaware Geological Survey.
Jordan, R.R., 1962, lanktonic Foraminifera and the Cretaceous-Tertiary Boundary in Central Delaware: Delaware Geological Survey Report of Investigation 5
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