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Pondville Conglomerate

Pondville Conglomerate - Quartz conglomerate having abundant sandy matrix; boulder conglomerate, arkose; fossil plants. Pondville Conglomerate is present in Narragansett and Norfolk basins. Although Chute (1964, 1966, 1969) recognized a lower boulder conglomerate member and an upper sandstone to pebble conglomerate member in the Pondville in the northeast part of the basin, such a division is not readily made to the southwest because of facies changes. Upper member grades into and interfingers with Wamsutta Formation. Basal beds nonconformably overlie Dedham Granite in northern part of Narragansett basin. Age of deposits in Narragansett and Norfolk basins ranges from Early to Late Pennsylvanian; however, Skehan and Murray (1980) assigned lower part of Pondville to Mississippian. Further study may reveal even older Paleozoic sediments in Narragansett basin (Goldsmith, 1991).
StateMassachusetts
NamePondville Conglomerate
Geologic ageLower Pennsylvanian
Original map labelPp
CommentsPart of Milford-Dedham Zone (Tertiary and Older Rocks) Secondary unit description per MA023.
Primary rock typeconglomerate
Secondary rock typearkose
Other rock types
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone > Arkose
Sedimentary > Clastic > Conglomeratequartz conglomerate having abundant sandy matrix; boulder conglomerate
Map references
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
Unit references
Zen, E-An (ed.), Goldsmith, R. (comp.), Ratcliffe, N.M. (comp.), Robinson, P. (comp.), Stanley, R.S. (comp.), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.
Goldsmith, Richard, 1991, Stratigraphy of the Milford-Dedham zone, eastern Massachusetts; an Avalonian terrane, Chapter E, IN Hatch, N.L., Jr., ed., The bedrock geology of Massachusetts: U.S. Geological Survey Professional Paper, 1366-E-J, p. E1-E62.
Geographic coverageBristol - Norfolk - Plymouth

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