340. Falls of French Creek

 TOWNSHIP: Warwick
QUADRANGLE: Pottstown
LOCATION: In the village of St. Peters, about 3/4 mile north of Pa. Route 23 at Knauertown.

REMARKS: French Creek passes over a diabase (igneous rock) sheet in a series of rushing cascades over diabase boulders as the creek descends some 50 feet to the valley.

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375. Marsh Creek Bog

 TOWNSHIP: East Nantmeal
QUADRANGLES: Wagontown and Elverson
LOCATION: Seven and five-tenths miles west of the Pennsylvania Turnpike, interchange 23 (Downingtown); along Marsh Creek approximately 4.0 miles south, east of Elverson.

REMARKS: Bogs are uncommon in southeastern Pennsylvania. This one on Marsh Creek is the finest example in this part of the state. The site is famous for the pollen and C-14 studies conducted here; it is a key site for evaluating the biological and geological prehistory of the state.

REFERENCES: Bricker, O. P. and Moss, J. H. [1958], Origin of the Marsh, East Nantmeal Township, Chester County, Pennsylvania, Pennsylvania Academy of Science Proceedings, v. 32, p. 168-171.
Deevey, E. S., Jr., Gralenski, L. J., and Hoffren, V. [1959], Yale natural radiocarbon measurements, Part 4, American Journal of Science Radiocarbon Supplement, v. 1, p. 144-172.
Martin, P. S. [1958], Taiga-tundra and the full-glacial period in Chester County, Pennsylvania, American Journal of Science, v. 256, p. 470-502.

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