HUDSON - MOHAWK LOWLANDS



MOHAWK VALLEY FOSSILS

The following two sites were submitted by Mike Huggins, Irvine, Ca

1. Middle Ordovician Snake Hill Shale: Small park at Fenimore Bridge (at
Baker's Falls on the Hudson River), west side of Hudson River, Town of
Moreau, Saratoga Co. (across from GE plant at Hudson Falls; site may be
accessed by turning west onto John St., from River St -Rt. 4- in the village
of Hudson Falls, NY).  Here there is a small park where people can see gently
dipping Middle Ordovician (Trentonian) Snake Hill Shale, with abundant
graptolite fossils.  Approximately 50 ft of the shale is exposed (blasted out
for a canoe portage).  Students can find abundant graptolites in boulders
along the paved trail at the park.  The graptolites look like Orthograptus.
 Students can also see  cleavage intersecting the shale bedding planes at an
angle; near-vertical jointing; small thrust faults which intersect an approx.
1-ft thick limestone bed (the limestone bed may also have a weathered
bentonite volcanic ash bed at its base); and calcite-filled veins.

2. Blocks of fossiliferous Middle Ordovician (Trenton) limestone at the base
of the Taconic overthrust, Rt. 40, Easton (Wash. Co.), NY.  These are exposed
blocks of "Bald Mountain-type" limestones with abundant Middle Ordovician
fossils: Sowerbyella and Rafinesquina brachiopods and Cryptolithus
trilobites, and other fossils.  The rocks (near-vertical beds) were detached
and were caught up at the base of the Giddings Brook Thrust Fault, during
Taconic Orogeny overthrusting.  This exposure is on the east side of Rt. 40,
between Middle Falls and Schaghticoke NY, approximately 2.5 miles south of
the intersection of Rts. 29 and 40, in Easton, NY (access:  Exit 14 off I-87
in Saratoga, Rt 29 eastbound to Schuylerville and Greenwich, south on Rt. 40
before Middle Falls and Greenwich).  Caution:  fast-moving traffic; outcrop
very close to road; not safe for small children or big groups.



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