The Niagara Limestone of Pike Co., j 
Missouri. 
By K. R. EowLEY, (Au iy ville, Mo. 
Ill the March luunber of The Natural- 
ist we describeil an outcrop of Lime- 
stone near Kdj^ewootl, Mo., which we 
referred to the top of the Hudson River 
Group. Since writing tliat iirtiele we 
have received a communication from Mr. 
Chas. Schuchert, of Albany, N. Y., and 
find he has changed his former opinion 
as to the Edgevvood beds and, from a 
study of its fossils, lie is now led to 
believe the outci'op is of the Clinton 
Group. True, the fossils seem to be a 
commingling of Trenton and Niagara 
forms, but we are of the opinion that the 
weight of evidence places this stratum 
at the top of the Hudson Rivei' Group, 
and so we shall leave it for the present. 
Overlying the Hudson River Group at 
a number of outcrops in the county is a 
single stratum of from two and a half to 
four feet in thickness of a white oi- 
brown Oolitic limestone yielding at some 
places an abundance of Corals, together 
with a few other small fossils. 
In a weathered outcrop near the Grassy 
creek bridge, three miles north west of 
Louisiana, were obtained the following 
fossils; Stromatopora sp?.Favosites (possi- 
bly two unidentified species). Hnlysites 
catenulotus. Zaphrentisfspf, a small Orthis. 
two species of Streptorlnjnchus, a small 
Bhynchonella, Nucleospira pis iformis , At- 
rypa nodostriata, Modiolopsis vndulostri- 
ata, a small undetermined iaHieZhftrajic/i, 
a large fine Cyclonema like Gasteropod. 
Cnlymene niagarensis, Encrinurus orna- 
tus, a Tentaculites . and a few other unde- 
termined forms. 
At another point, south of Louisiana, 
on Noix creek, a small slender Cyathophyl- 
loid Coral was added to the above list. 
Near Dover church, ten or eleven miles 
S. E. of Louisiana, is a weathered out- 
crop where an abundance of specimens 
of Cyothophylloid Corals and Favosities 
were found loose in the cla3'S of the ra- 
vines. A mile or two nearer Louisiana, 
the Oolite forms a back bone on the low 
hills to the east of the read. The face of 
this ridge or back bone is set with Favos- 
ites and a few si)ecimens of a Cyrtolitesf 
were found in the clay. 
On the town branch in Louisiana, near 
the "Big spring" the Oolite is brown, but 
contains only a few poorlj^ preserved 
fossils, being overlain by two or three 
feet of an earthy brown limestone in 
which was noticed a single specimen of 
Streptorhynehus . 
On the river front above the Diamond 
Flouring Mills, the Oolite is a beautiful 
white and we have seen a single annulate 
Orthocerus from this point. 
At the mouth of Buffalo creek the 
Oolite is white and upon it rests seven or 
eight feet of a yellowish clay sandstone, 
probably of the same age as the Oolite, 
but as the fossils found are an imperfect 
shell and a poorly preserved small Coral. 
no definite conclusion as to the age of the 
sandstone can be arrived at. 
We stated above that the Oolitic forms 
but one stratum or layer. We wish to 
modify the statement a little by saying 
that at some of the outcrops there is an 
imperfect seam near the middle of the 
depth and when the stone is split at this 
suture or seam one of the surfaces is 
found crowded with Cyathophylloid Cor- 
als possibly a species of iStreptplasma. 
The Oolite when quarried is very hard 
and wears well as a building stone. T'he 
earthy sandstone above, may be easily 
worked when fresh from the eaith, but 
becomes hard and enduring on exposure. 
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OLIVER DAVIE 
'E FOURTH EDITION. 
' Introduction by 
illustrations by 
THEODORE JASPER, A- M,, M, D., 
AND 
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