ORTMANN : TERTIARY INVERTEBRATES. 285 
patagonian ,” “ Juliense ” and “ Leonense " are consequently to be dropped , 
and the whole series should retain the old name: Patagonian beds} 
The contention of Ameghino that there is an hiatus in time between 
Patagonian and Suprapatagonian beds , is completely erroneous. (See 
Hatcher, 1900 a, p. 100.) 
Nevertheless, differences in the fauna are recognizable in different 
localities. This refers especially to the fauna of the typical beds at Santa 
Cruz. Some of the most characteristic species (for instance Cucullcea 
alia, Struthiolaria ornata, Siphonalia domeykoana ) have been found no- 
where else in Patagonia, while they are abundant at Santa Cruz (includ- 
ing Mt. of Observation, Las Salinas, etc.). This fact, in my opinion, is 
due to the different development of the facies. The region around the 
mouth of the Santa Cruz River is distinguished from the rest by its facies.' 
(See Hatcher, 1900 b, p. 264.) All other localities have a more or less 
sandy facies, often changing into a shell breccia, and these deposits ap- 
parently were laid down in very shallow water, close to the shore, at any 
rate, in shallower water than the deposits at the mouth of the Santa Cruz 
River. This would sufficiently explain the slight differences of the re- 
spective faunas. 
Geographically, the sandy facies seems to extend over all the country 
from the coast of San Julian to the Cordilleras, and southward to Punta 
Arenas. The clay deposits with concretions have only a local develop- 
ment, near the mouth of the Santa Cruz River. 
Ameghino’s “Piso Juliense” represents the local fauna of San Julian; 
his “Piso Leonense” that of the mouth of the Santa Cruz River. 
The Patagonian beds , as understood here, were deposited in many 
localities (observed at : Salt Lake, Arroyo Gio, Lake Pueyrredon) on the 
eroded surface of the barren sandstones of the Guaranitic beds (see 
Hatcher, 1900 a, pp. 93 and 108 ; at Lake Pueyrredon there is a basaltic 
layer between both). In other places they overly other Tertiary beds, 
but there are only two localities where this has been observed : Mayer 
Basin, where the Upper Lignites are below them, and especially Punta 
Arenas, where the Magellanian series precedes them in time, consist- 
1 The question remains whether we ought to call these beds by that name at all. The older 
writers, especially d’Orbigny, understood under “Patagonian beds” deposits of a different age, 
and the fact is, that most of d’Orbigny’s Patagonian fossils do not belong to what is now called 
by that name ; they come chiefly from Entrerios and the region of the Rio Negro. 
