560 N. H. DARTON FISH REMAINS IN ORDOVICIAN ROCKS 



Southeast of Garden park lie Sixmile, Eightmile, and Cemetery parks, 

 valleys which mark the eastward and northeastward extension of the 

 Fountain Eed beds across the north end of the Front Eange anticline. 

 On the north side of these parks are slopes of Ordovician limestones and 

 sandstones, comprising Manitou and Harding, with Fremont as far east 

 as Eightmile creek, northeast of which the Fountain formation lies di- 

 rectly on the Harding sandstone. Outliers of Manitou limestone occur at 

 intervals high on the granite slopes north. Three miles southwest of 

 Garden park is Shaw park, underlain by a zone of Fountain Eed Bed 

 outcrops which extend southward to Arkansas river west of Canyon City. 

 On the west side of this zone the Ordovician limestones and sandstones 

 extend far up the mountain slopes, while on the east side is a hogback of 

 Dakota sandstone. At the north end of Shaw park there is a prominent 

 fault, which crosses Wilson creek nearly at right angles and brings for- 

 mations from Ordovician to Cretaceous into contact with the pre-Cam- 

 brian rocks. 



RELATIONS WEST OF CANTON CITY 



In the mountain slopes and hogback west of Canyon City there is pre- 

 sented the southward extension of the formations of the Garden Park 

 area. The formations all dip steeply to the eastward, and there are 

 numerous exposures of all the beds. The high mountain range west, con- 

 sisting of granite and gneiss, is traversed by Arkansas river in a deep 

 ridge the Ordovician rocks are extensively exhibited (see figure 1, plate 



On the mountain road 4% miles northwest of Canyon City the Manitou 

 limestone lies directly on the granite. It is 10 feet thick and contains 

 bands of chert. Next above is characteristic Harding sandstone, pink and 

 buff, except at the top, where there is a characteristic succession of red- 

 dish shales. The Fremont limestone appears with its usual characteristics, 

 and apparently also the Millsap limestone, although no Carboniferous 

 fossils were observed at this place. The upper portion of the Millsap 

 limestone presents a very irregular contact with conglomerate beds at the 

 base of the Fountain Eed beds. In the vicinity of Harding's quarry, 2 

 miles northwest of Canyon City, the Manitou limestone is seen to have 

 disappeared, and it is not found again in the extension of the beds south- 

 ward. The following detailed section in this vicinity was made by Mr 

 C. D. Walcott:* 



* C. D. Walcott : Discovery of a vertebrate fauna In Ordovician strata. Bull. Geol. 

 Soc. Am., vol. 3, 1892, pp. 155-157. 



