482 Ortmann — Some new marine Tertiary horizons. 



come from the horizons II, III, and V, and are not all of the 

 same age. 



3. Horizon Y closely resembles the Suprapatagonian beds of 

 Patagonia. No conclusive evidence has been found indicating 

 the presence of the true Patagonian beds. 



4. The horizons II and III have a few species in common. 

 Both differ entirely from Y, none of their species having been 

 found in Patagonia. Thus these two horizons form a deposit 

 that is paleontologically and stratigraphically well separated 

 from the Suprapatagonian beds (and paleontologically also 

 from the Patagonian beds). 



5. There are some relations of the horizons II and III to 

 the so called Navidad beds of Chile (5 species). Since these 

 latter beds show also very many relations to the Patagonian 

 and Suprapatagonian beds, and since of the five Navidad 

 species found near Punta Arenas none has been found in 

 Patagonia, it is very probable that the Navidad series contains 

 a number of horizons of different age, a part of which is to be 

 compared with these two horizons of Punta Arenas, while 

 another part is identical with Patagonian deposits."'*' 



6. Since we have ample reason to consider the Suprapata- 

 gonian beds as of Miocene age,f the question of the geological 

 age of horizon Y seems to be settled. As to horizons II and 

 III, stratigraphical evidence points to an older age, perhaps 

 Eocene, and the general character of the fossils does not con- 

 tradict this assumption. But it is well to be noted that very 

 few, if an}', direct confirmations of the Eocene age have been 

 found by a comparison of the species with those of known 

 Eocene faunas. On the other hand, Cretaceous age of these 

 two horizons seems to be out of the question, since no charac- 

 teristic Cretaceous fossils have been discovered, although such 

 forms (Ammonites) are known from a locality not far away 

 (Port Famine). 



I hope Mr. Hatcher will again direct his attention to these 

 beds, and, if possible, settle the question of their relation to 

 the Cretaceous deposits of Port Famine as well as the question 

 of the lack of true Patagonian beds in this region. A com- 

 plete account of the geology of these parts will be given by 

 Mr. Hatcher after his return from Patagonia. 



Princeton University, September, 1S98. 



* This view is supported by the thickness of the Navidad beds. Darwin gives 

 800 feet for the cliffs forming the JSTavidad beds (G-eol. Obserr. South America, 

 1846, p. 127). 



f Compare Hatcher, 1. c , p. 337 ff , and Moericke, 1. c, p. 593 and 596. 



