366 B. BROWN CRETACEOUS-EOCENE CORRELATION IN NEW MEXICO 



ripples are preserved one above the other. Each series was evidently 

 formed by currents coming to the shoreline from a different angle, as no 

 two are parallel. On one of these slabs collected there are worm tracks 

 and several impressions of a horsetail rush, identified by Dr. A. Hollick 

 as Equisetum sp. no v. 



One and one-half miles above Tolman, at a point 190 feet above the 

 river, a skull and partial skeleton of Aiikylosaurus was collected, and 

 with it were associated several fruits, identified by Dr. F. H. Knowlton as 

 Ficiis russelU. At this same station several poorly preserved plant re- 

 mains were secured from a hard argillaceous sandstone at the water level. 

 Tliey are identified by Dr. A. Hollick as a rhizome ?, possibly of an aqua- 

 tic plant, Cycad ? sp., a leaf, and Cycad ? sp., a fniit, l)ut are not diag- 

 nostic of the age of the beds. 



Below Tolman for 16 miles there is little appreciable change in the 

 appearance of the beds, which are chiefly clay ; local strata of hard sand- 

 stones appear and disappear in a short distance, and in two or three 

 places there are beds, unmistakably, of stream channels. One particu- 

 larly noticeable is seen at water level 3 miles above Tolman and another 

 at a point capping the section 16 miles below Tolman. 



Four miles below Tolman on the right bank, at a point 100 feet above 

 the river, there is a conspicuous bed of shells: Anoniia niicronema Meek, 

 Corbicula occideniaUs M. and H., Panopwa simulairix Whiteaves, Panor 

 pcea curia Whiteaves, all brackish-water forms, associated with broken 

 shells of Ostrea sp. This shell bed appears again 6 miles below Tolman 

 on the left bank, about 110 feet above the river, and 1 mile farther down 

 the river, where shells, Corbicula occidentalis, fomi a solid bed 18 inclies 

 thick. 



At Stauffei-'s, 16 miles below Tolman on the left bank, there is a bed 

 of Ostrea sp. 2 feet thick in approximately this same horizon. The same 

 oyster-bed appears at the head of Fox Coulee, 1 mile from Munson, in 

 the cut of the Canadian Pacific TJailroacl, 20 feet below the prairie level, 

 where the following shells were collected: Ostrea (jlahra M. ami 11., 

 Anomia sp., Mytilus sp., Lunatia concinna M. and H. ?, all brackish-water 

 and marine Cretaceous types that are common to the Judith Eiver and 

 the base of the Lance. 



The stations represented by these four lots of shells do not vary 25 feet 

 above or below a horizontal plane, and T think they are on the same level. 



A Plesiosaur skeleton, which I have flescribed under the name Louro- 

 spondylus uUimus, was found in approximately the same stratum, 6 miles 

 below Tolman on the left bank, 120 feet above the river. This specimen 

 is interesting chiefly because it extends the history of the group of Meso- 



