268 - Scientific Intelligence. 
crowded together i in the same profusion with which they have often been 
noticed by myself and others as occurring in the Lower Silurian shales 
and limestones of the Wisconsin lead region, around Big Bay des No- 
quets, and in many other localities in the country bordering on the great 
akes. 
Both the upper and lower divisions of the Silurian appear to be repre- 
sented by the fossils of the Hot Creek District; but the crept Silurian 
seems to be much the most prolific in fossils, as is the case in Wisconsin 
and Iowa. The particular period to which these ev Silurian forms 
may be referred is the Trenton, including the Chazy, Birdseye, Black 
river and Trenton limestones of the New York geologists, and the Buff 
and Blue limestones of the western surveys. Nearly all the prevailing 
of the eastern rocks of this age are represented in the 
collection, namely, oa Gasteropods, Cephalopods, Crinoids, Tri- 
lobites, and Corals; and there are among them several of the most 
New York, and the rocks of the same age ‘farther west. 
fragments of Trilobites, two or three different genera may be ras 
ne en Asaphus, which is represented by a species apparen 
ere are also fragments of Crinoids or Cystids closely ete, 
the | species figured by Hall, in the Paleontology of New York, vol. i, as 
Lchino-encrinites anatiformi 
The rocks containing the above-mentioned | fossils crop out in the sides 
a deep cafion; and ove erlying them, - a perpendicular distance of 
about a thousand feet, is a series of beds containing numerous fragm 
of corals and crinoids, silicified and pera out from the surface of a 
bluish-gray limestone, which I refer without much doubt to the age of 
the Niagara limestone of New York. Among the corals, Heliolites spt- 
nipora and Syringopora are recognizable; and among the € crinoidal frag- 
men stems 0 ica — to be ct nus orna 
and lying 
one hundred and fifth meridian. Dr. Hayden says, in his paper, on t 
- and Natural History of the Upper Missouri, published in 1862, 
that “ hitherto no indications of the existence of any other member (than 
ited 
represented in the Rocky mountains, although no fossils of that member 
the se res have been as yot dincovered anywhere tothe west af th 
