in the Rio Grande Valley, New Mexico. 



61 



Platyceras peculiare 

 Platycrinus parvin odus 

 Dory annus unicorn is 

 Stegonocrinus sculptus 

 Physetocrinus lobatus 

 Periechocrinus ivhitei 

 Fehestella sp. 



Productus aff. arcuatus 

 Spirifer aff. grimesi 

 Spirifer imbrex ? 

 Reticularia cooperensis 

 Athyris lamellosa 

 Athyris ? sp. 



Crinoids are more abundant in this bed both in species and 

 individuals than in the shaly beds below. Concerning the re- 

 lations of this fauna, Dr. Girty says*: — " The crinoid-bearing 

 beds at Lake Yalley have long been known to paleontologists, 

 and they are generally regarded as of lower Burlington age." 

 Beds 5 and 6 contain corals, crinoicl plates and steins, but good 

 specimens are difficult to obtain. 



LAKE VALLEY LIMESTONE. 



Fig. 1. Sketch profile section at Lake Valley, New Mexico, showing the 

 stratigraphic relations of the formations and the position of ore deposits 

 (represented by the heavy black line) within the Lake Valley limestone. 

 After F. M. Endlich. 



Two miles east of Hillsboro a good exposure of the Lake 

 Yalley formation shows the lower beds 5 and 6 to be wanting, 

 and the upper crinoidal beds 7 and 8 are seen resting upon the 

 eroded surface of bluish gray calcareous shales carrying an 

 abundant Devonian fauna. Following is a list of fossils ob- 

 tained from the crinoidal beds at this locality: — 



Fossils from Hillsboro. 



Michelinia ? sp. 

 Zaphrentis sp. 

 Amj>lexiis sp. 

 Periechocrinus whitei 

 Rhodocrinus wortheni var 

 urceolatus 



Rhipidomella dalyana 

 Productus semireticulatus 

 Productus aff. scabriculus 

 /Spirifer imbrex ? 

 Spirifer aff. peculiaris. 

 Delthyris nova-mexicana 



* Personal letter. 



