|Name||Lower Member of the Kirkwood Formation|
|Geologic age||lower Miocene, Burdigalian and Aquitanian|
Unconsolidated > Coarse-detrital > Sand (Bed)Upper sand facies: sand, typically fine- to medium-grained, massive to thick-bedded, locally crossbedded, light-yellow to white, locally very micaceous and extensively stained by iron oxides in near-surface beds. The thick-bedded strata commonly consist of interbedded fine-grained, micaceous sand and gravelly, coarse- to fine-grained sand. Some beds are intensely burrowed. Trough crossbedded strata with high concentrations of ilmenite and a few burrows are most commonly seen in the Lakewood quadrangle.
Unconsolidated > Fine-detrital > Clay (Bed)Lower clay facies: clay and clay-silt, massive to thin-bedded, dark-gray, micaceous, contains wood fragments, flattened lignitized twigs, and other plant debris. Locally, the clay has irregularly shaped sand pockets, which may represent some type of burrow.
|Comments||part of the Kirkwood Formation (described seperately, but not mapped): Kirkwood Formation (middle and lower Miocene, Serravallian to Aquitanian) - Consists of the Wildwood Member and an informal lower member on the central sheet and the Belleplain Member, Wildwood Member, Shiloh Marl Member, and lower member on the southern sheet. The Belleplain Member is a new member named for beds occurring in a corehole drilled by the U.S. Geological Survey at Belleplain State Forest Headquarters, Cape May County. The Wildwood Member is a new member named for beds occurring in a drillhole at Wildwood Beach, Cape May County.|
Dalton, R.F., Herman, G.C., Monteverde, D.H., Pristas, R.S., Sugarman, P.J., and Volkert, R.A., 1999, New Jersey Department of Environmental Protection, Bedrock Geology and Topographic Base Maps of New Jersey: New Jersey Geological Survey CD Series CD 00-1; ARC/INFO (v. 7.1), scale 1:100,000.
Owens, James P., Sugarman, Peter J., Sohl, Norman F., Parker, Ronald A., Houghton, Hugh F., Volkert, Richard A., Drake, Avery A., Jr., and Orndorff, Randall C., 1998, Bedrock Geologic Map of Central and Southern New Jersey: U.S. Geological Survey Miscellaneous Investigations Series Map I-2540-B, 8 cross sections, 4 sheets, each size 58x41, scale 1:100,000.
Kmmel, H.B., and Knapp, G.N., 1904, The stratigraphy of the New Jersey clays, in Ries, Heinrich, and Kmmel, H.B., The clays and clay industry of New Jersey: New Jersey Geological Survey, Final Report of the State Geologist, v. 6, p. 117-209
Andrews, G.W., 1988, A revised marine diatom zonation for Miocene strata of the Southeastern United States: U.S. Geological Survey Professional Paper 1481, 29 p.
Sugarman, P.J., Miller, K.G., Owens, J.P., and Feigenson, M.D., 1993, Strontium isotope and sequence stratigraphy of the Miocene Kirkwood Formation, southern New Jersey: Geological Society of America Bulletin, v. 105, no. 4, p. 423-436.
Goldstein, F.R., 1974, Paleoenvironmental analyses of the Kirkwood Formation: New Brunswick, N.J., Rutgers University, unpub. Ph.D. dissertation, 70 p.
Andrews, G.W., 1987, Miocene marine diatoms from the Kirkwood Formation, Atlantic County, New Jersey: U.S. Geological Survey Bulletin 1769, 14 p.
|Counties||Burlington - Camden - Cumberland - Gloucester - Monmouth - Ocean - Salem|