266 
PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 
“Patagonian formation ,” and Ameghino subdivides this into a lower part, 
“Piso Juliense,” and an upper part, “ Piso Leonense.” The upper division 
he calls by the name of “ Suprapatagonian ” beds, and separates it from the 
Patagonian formation, making it a subdivision, “Piso Suprapatagonico,” 
of the Santacruzian formation. V. Ihering follows him in this arrange- 
ment, and gives “Santacruzian formation” as the horizon for all marine 
“Suprapatagonian” fossils. (It is well to bear in mind that v. Ihering’s 
“Santacruzian” means the same as Ameghino’s “Suprapatagonian.”) 
As Hatcher (1900 a, p. 99, ff, and 1900 b, p. 263, ff.) has repeatedly indi- 
cated in his preliminary publications, he has failed entirely to verify these 
subdivisions of the marine beds underlying the typical (non-marine) San- 
tacruzian beds, and he was unable to find any stratigraphical evidence for 
them, and I shall endeavor here to show that the paleontological material 
collected also fails to warrant any subdivisions of this marine series. 
In order to demonstrate this, we must choose the type-locality at the 
mouth of the Santa Cruz river and its fauna as a starting point. Accord- 
ing to Hatcher (1900 b), the deposits at this locality consist of several 
hundred feet of soft sand and clays, often filled with hard concretions, 
and interrupted occasionally by a stratum of hard sandstone. The fossils 
are found both in the loose material and in the harder concretions. 
The following is the list of all fossils recorded from this locality : 
1. Cidaris antarctica. 
20. 
Perna quadrisulcata. 
2. Schizaster ameghinoi. 
21. 
Ostrea ingens. 
3. Aspidostoma giganteum. 
22. 
Pecten proximus. 
4. Reticulipora patagonica. 
23 - 
Pecten prcenuncius. 
5. Tenny sonia subcylindrica. 
24. 
Pecten geminatus. 
6. Rhynchonella plicigera (v. Ih.). 
25. 
Pinna semicostata (v. Ih.). 
7. Terebratella dorsata var. 
26. 
Mytilus cf. chorus (v. Ih.). 
8 . Terebratella patagonica. 
27. 
Crassatellites lyelli. 
9. Nucula patagonica. 
28. 
Cr as satellites kokeni. 
10. Nucula reticularis. 
29. 
Crassatellites quartus. 
11. Le da glabra (Sow., v. Ih.). 
30 . 
Cardita elegantoides. 
12. Leda oxyrhyncha. 
3 i- 
Cardita incequalis. 
13. Leda err azurizi. 
32. 
Cardita patagonica. 
1 4. Malletia ornata. 
33 - 
Lucina promaucana. 
1 5 • Cucullcea alta. 
34 - 
Lucina ortmanni. 
16. Cucullcea darwini. 
35 - 
Cardiurn philippii. 
1 7. Limopsis insolita. 
36. 
Cardium puelchum. 
18. Area patagonica. 
37 - 
Cardium pisum. 
19. Glycimeris ibari. 
38 - 
Amatlmsia angulata. 
