Reef Rock at Akron Falls (lower), Akron, New York
The caprock of the waterfall (dry in first two photos) consists of massive reef rock, i.e. Victor Dolostone, part of the Fiddlers Green
Formation in the area. The reef rock, massive and poorly bedded, is a microbialite amazingly produced by microscopic organisms
that trapped and/or precipitated Calcium Carbonate that was dolomitized probably early in the formation of the deposits. The
Victor Dolostone here rests upon the Morganville Waterlime, a very fine-grained dolostone with conchoidal fracture. Elsewhere,
salt hoppers have been described from this unit indicating a hypersaline environment of deposition. The reef rock too may have
formed under hypersaline conditions.
Below this are the shaly dolomitic deposits of the Oatka Formation and lower still are probably beds of the Camillus Formation,
all of Late Silurian age. Upstream is another falls (Upper) with cherty Onondaga Limestone as the caprock.
The caprock of the waterfall consists of massive reef rock, i.e. Victor Dolostone part of the Fiddlers Green Formation in the area. In
this view, the creekbed is almost completely dry (July 2012) and the deep weathering of the reef rock can be seen with potholes
and many erosional features that have formed since the glaciers left the region. Much of the water that flows along Murder Creek
is lost in joints and fissures along the route only to reappear at the cave and other outlets in the face of the falls. The best time to
view the waterfall is in early Spring when tremendous amounts of water flow through the creek.
The Victor Member of the Fiddlers Green Fm.
(Late Silurian Bertie Group) throughout its
extent (Passage Gulf in the east to Ontario,
Canada in the west) bears a variety of
microbialites. The photo at right shows a
closeup of a sample from the massive reef
shown in the photos above. Note irregular black
carbonaceous layers that trap sediment and
help bind the deposit into massive,
poorly-bedded rock. Photo taken at Murder
Creek May 2012. Sometimes distorted, micri-
tized brachiopods are recognized within the
matrix as well as microvugs lined with drusy
LEFT: Pterygotid carapace, presumably Acutiramus
macrophthalmus, from the Victor Dolostone near
Manchester, New York. Note the large anterior
BELOW: Algal mats that are associated with the
eurypterids found in the Victor Dolostone.
The lower falls along Murder Creek at Akron, New
York showing the water pouring over the massive
Victor Dolostone (the cave is behind the waterfall).
Note water exiting rock layers about half way
down, some coming from small caves in the
rockface. The lower, softer shaly layers belong to
the Oatka Formation and below this are probably
the softer shaly beds of the Camillus Formation
(Salina Group). Photo taken May 15, 2011.
A large thrombolite from the Victor Dolostone of
Ontario, Canada can be viewed HERE.
See also STROMATOLITES.