RESUME 565 



contain Mississippian fossils. This limestone caps the sloping ridges west 

 and south of Manitou and appears extensively in the intervening canyons, 

 especially in Williams canyon. Its outcrop, together with that of the 

 underlying sandstone, is terminated by overlap of the Fountain formation 

 a mile north of Glen Eyrie, but it reappears in the small embayment west 

 of Monument park. In this latter outlier there are exposed, lying on the 

 granite, 30 feet of dark-gray, coarse sandstones, thin bedded and glau- 

 conitic at the top, overlain by 20 feet of bright-red, sandy limestone with 

 Cambrian fossils, and by 50 feet of massive, pure, fine grained, light-gray 

 limestone. On this limestone, which apparently is Manitou, lies an im- 

 pure limestone varying from gray to buff in color, with a heavy breccia at 

 its base, the latter probably marking an unconformity. The limestones 

 are cut off by a fault, bringing down the Morrison and overlying "Dakota," 

 but a short distance to the north and south the Fountain Eed beds are 

 exposed lying directly on the granite. 



Doctor Peale gives a section of the exposure of Manitou limestone and 

 associated formations on Camp creek, at Glen Eyrie,* which has 30 feet 

 of limestones, mostly red, believed to be of Ordovician age, separated from 

 the granite by 50 feet of sandstones. 



DEADMAN CREEK 



On Deadman creek, 6 miles south of Perry park, a small outlying area 

 of Lower Paleozoic rocks has been investigated by Mr Willis T. Lee.f 

 The rocks are cherty limestones in layers interstratified with red clay, 

 overlying a few feet of deep-red quartzite of supposed Cambrian age. The 

 fossils obtained were examined by Doctor Weller, who found the best pre- 

 served speciemns to be Dalmanella testudinaria of Ordovician age. 



PERRY PARK 



A second exposure of this limestone, with similar characters, occurs in 

 the southern portion of the Perry Park embayment at the head of the 

 easternmost prong of West Plum creek, as noted by Doctor Peale, of the 

 Hayden survey. Mr Lee found no fossils at this locality. 



Kesume 

 In figure 6 there is indicated the area of outcrops of the Ordovician in 

 a portion of the Northwest, and also the probable underground distribu- 

 tion of rocks of that system. We have little or no light as to the extent of 

 the area of original deposition, for all of the region, at least south of 



* A. C. Peale : Geology of the South Park division. Seventh Annual Report, U. S. 

 Geol. and Geog. Survey of the Territories, 1874, p. 201. 



t W. T. Lee : Geology of the Castle Rock region, Colorado. Am. Geologist, vol. 29, pp. 

 96-97. 



LII — Bull. Geol. Soc. Am.. Vol. 17, 1905 



