weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1898. 73 
602 Patton (H. B.). Peculiar geological formations on the headwaters 
of the Eio Grande, Colorado. 
Colo. Sci. Soc, Proc, vol. v, pp. 171-172, 2 pis., 1898. 
See Bibliography and Index for 1896, No. 529. 
603 Tourmaline and tourmaline schists from Belcher Hill, Jeffer- 
son County, Colorado. 
Abstracts: Science, new ser., vol. viii, pp. 464-465 (% p.); Am. Geol. 
vol. xxii, p. 251 (i p.), 1898. 
604 Pearce (Richard). The mode of occurrence of gold in the ores of 
the Cripple Creek district [Colorado]. 
Colo. Sci. Soc, Proc, vol. v, pp. 5-10, 1 pi., 1898. 
See Bibliography and Index for 1896, No. 531. 
605 Further notes on Cripple Creek ores [Colorado]. 
Colo. Sci. Soc, Proc, vol. v, pp. 11-16, 1898. 
See Bibliography and Index for 1896, No. 532. 
606 Occurrence of tellurium in oxidized form associated with gold. 
Colo. Sci. Soc, Proc, vol. v, pp. 144-147, 1898. 
Describes material from the Black Hills, South Dakota. 
607 Some notes on the occurrence of uraninite in Colorado. 
Colo. Sci. Soc, Proc, vol. v, pp. 156-158, 1898. 
See Bibliography and Index for 1896, No. 533. 
608 — — Notes on the occurrence of a rich silver and gold mineral con- 
taining tellurium in the Griffith lode, near Georgetown, Clear 
Creek County, Colorado. 
Colo. Sci. Soc, Proc, vol. v, pp. 242-243, 1898. 
See Bibliography and Index for 1896, No. 534. 
609 Notes on the occurrence of tellurium in an oxidized form in 
Montana. 
Colo. Sci. Soc, Proc, vol. v, pp. 244-245, 1898. 
See Bibliography and Index for 1896, No. 535. 
610 Note on the occurrence of rhodocrosite in the Original mine, 
Butte, Montana. 
Colo. Sci. Soc, Bull. No. 1, p. 8, 1898. 
Contains brief description of occurrence and of the associated min- 
erals. 
611 Notes on the occurrence of selenium with pyrite rich in gold 
and silver. 
Colo. Sci. Soc, Bull. No. 5, pp. 1-2, 1898. 
Describes material from Mexico and gives the results of an assay. 
612 Remarks on a gold nugget from Montana. 
Colo. Sci. Soc, Bull. No. 5, pp. 2-3, 1898. 
Describes a specimen from Bear Gulch, Montana, and gives its 
chemical analysis, showing the presence of tellurium. 
