, 
Oo” 
undoubtedly of organic origin and was the last traces left of 
the living being whose carbonaceous material had reduced 
the Peroxide of [ron to a Proto-compound, showing itself in 
the change of color from red to white or green. The same 
oxidizing agency: which had Peroxidized the Iron had de- 
composed the organic form, which had hence disappeared, as 
these deposits were doubtless thrown down from a slowly 
retreating sea the animal remains being thus gradually and 
slowly exposed to the disintegrating and oxidizing effect of 
the atmosphere. A similar instance of the obliteration of 
organic remains on the shores of a sea teeming in animal life 
was to be seen in the mud-floats of the Bay of Fundy, where 
the great tides laid bare extensive tracts in which few traces 
of organisms were to be found. The Medina Sandstone, 
which is also red in color, contains no fossil remains, only 
casts which have been left to show where organisms once 
existed. 
Mr. George Gibbs said that he had remarked the fact of 
the paucity in organic remains of red colored rocks in the 
deposits of the Rocky Mountains and other points along the 
49th parallel. Ripple marks and rain-drop impressions were 
common, showing the exposure of the deposits previous to, and 
during hardening. The red jaspers of this region, however, 
had the impressions of bi-valve mollusca scattered throughout 
them. 
June 6, 1870. 
Prof. B. M. Martin, Vice President, in the chair. Twenty- 
one persons present. 
Dr. L. Feuchtwanger exhibited a remarkably-fine specimen 
of crystallized Cinnabar from California, and some crystals 
of Quartz from the Hot Springs of Arkansas, showing marked 
Strize upon the prismatic faces. 
3% 
