186 UNIVERSITY OF COLORADO STUDIES 
FENNEMAN, N. M. Geology of the Boulder District, Colorado, U. S. Geol. Sur., Bull. No. 
265, 1905. Discusses, inter alia, the Hygiene sandstone. 
HENDERSON, JuUNIUS. ‘Paleontology of the Boulder Area.” Univ. oj Colo. Studies, 
Vol. II, No. 2, pp. 95-106, 1904. 
“Scientific Expedition to Northeastern Colorado. II, Paleontology—Account 
of Collections Made.” Univ. of Colo. Stud., Vol. IV, No. 3, pp. 149-152, 1907. 
KNOWLTON, FRANK Hatt. Flora of the Montana Formation. U. S. Geol. Sur., Bull. 
No. 163, 1900. Discusses Halymenites major. 
MEEK, F. B. A Report on the Invertebrate Cretaceous and Tertiary Fossils of the Upper 
Missouri Country. U.S. Geog. and Geol. Sur. of the Terr. (“Hayden Survey”’), 
Mon., or Fin. Rept., Vol. IX, 1876. Descriptions and figures of the majority of our 
species are contained in this volume. 
United States Geological Exploration oj the Fortieth Parallel (‘King Survey”), 
Fin. Rept., Vol. IV, Pt. II, “Paleontology,’’ 1877. Describes and figures many of 
our species, including Anomia retiformis, from Fossil Ridge. 
STANTON, T. W. “Paleontological Notes.” Proc. Colo. Sci. Soc., Vol. Il, pp. 184-187, 
1888. Discusses Pierre fossils north of Boulder. 
STANTON, T. W., and Know ton, F. H. Geology and Paleontology of the Judith River 
Beds, U. S. Geol. Sur., Bull. No. 257. Contains a discussion of distribution of some 
so-called Fox Hills species and the relation of the Western Cretaceous formations. 
WELLER, STUART. Geological Survey of New Jersey: Paleontology, Vol. IV, 1907. On 
pp. 683-686 is a discussion of Gyrodes, two species of which are in our list. 
Wuirr, CHartEs A. “Report on the Paleontological Field Work for the Season of 
1877,” U. S. Geog. and Geol. Sur. of the Terr. (“Hayden Survey”), 11th Ann. Rept. 
(for 1877), pp. 161-319. Lists 13 species from Fossil Ridge. 
“Contributions to Invertebrate Paleontology, No. 2: Cretaceous Fossils of the 
Western United States and Territories.” Jd., 12th Ann. Rept. (for 1878), Pt. I. 
pp- 1-39- 
(These two papers describe and figure some of our Fossil Ridge species.) 
WHITFIELD, R. P. Gastropods and Cephalopods of the Raritan Clays and Greensand 
Marls of New Jersey, U. S. Geol. Sur., Mon., Vol. XVIII, 1891. Contains descrip- 
tions and figures of a number of our species and on page 32 discusses the strati- 
graphic relations of the Pierre and the Lower Mars. 
SYSTEMATIC PALEONTOLOGY 
PLANTS 
Halymenites major Lx. 
This sparsely branching seaweed, covered with tubercles and easily recognized, is 
very abundant in these beds from Rocky Ridge, six miles north, to Fossil Ridge, six miles 
south, of Ft. Collins, and in a higher sandstone east of Fossil Ridge. None found in the 
Pierre of the Boulder District, but abundant in the Fox Hills beds from Denver Basin 
northward. Found from top of Benton to Fox Hills, or perhaps Tertiary [Frank Hall 
Knowlton, Flora of the Montana Formation, U.S. Geol. Sur., Bull. No. 163, pp. 17, 18], 
and hence useless in the determination of the stratigraphic position of any member of the 
Pierre. 
