430 E. S. MOORE 
showed dirty-gray granules of a variety of shapes having a maximum 
size of 1.90 by 1.0 millimeters. They consist of calcite, chert, and 
iron oxide, the latter as a rule distributed in fine specks through 
the granules in an unusual manner indicating a probable replace- 
ment of organic tissues. It was in this section that the minute 
algae-like cells, previously described, were found (Fig. 16). Numer- 
ous veinlets of quartz following lines of fracture-cleavage indicate 
the extensive transfer of silica since these rocks were consolidated. 
These granules indicate a replacement of calcareous granules, in 
most places at least. 
Fic. 16.—Photomicrograph of granules from the iron formation. These consist 
of hematite, calcite, and silica, and the groundmass is mostly silica. From these 
granules the camera-lucida drawings were prepared (X 20). 
Fic. 17.—Photomicrograph of granules consisting chiefly of silica in which some 
hematite and magnetite occur, the lighter areas being silica (X20). From the cherty 
iron formation. 
Similar granules in a cherty matrix and carrying considerable 
magnetite were found in the rock described under g) in the section 
and spoken of as felsitic in appearance. 
Another specimen of red jasper with specks of gray opal-like 
silica was taken from one of the bright-red bands in the iron- 
formation. It was found to consist of granules of fine-grained 
chert, opal, and iron oxide. They show a great variety of shapes 
varying from ovoid, balloon-shaped, ham-shaped, and roughly 
