Bo gk eer eae Se oe tyne es) tered OLN 
Se a a5 
Eastern Kansas and Nebratka: 163 
of forms such as those mentioned above from Plattesmouth, as 
eminently a Lower Triassic (or Dyassic) fauna, seems inconceiy- 
able, excepting upon the supposition that he labors under some 
kind of a hard mental twist or bias on the subject of determin- 
ing the age of rocks by their lithological characters. 
After disposing of the so-called Lower Dyassic rocks at Plattes- 
mouth, Mr. Marcou takes boat again, and ascends the Missouri 
some fifteen or more miles to Bellevue, north of the broad allu- 
vial valley of Platte river. Here he saw a small exposure of 
Tocks, some fifteen feet in height above the river, composed of 
whitish and yellowish limestone, and. pale blue clays, altogether 
presenting different lithological characters from the outcrops 
seen below the Platte, and according to this favorite test of his, 
belonging toa very different epoch, or in other words to the 
Subcarboniferous. 
reticulatus, P. Cora, P. punctatus, P. scabriculus, P. pustulosus, P. 
pyxidiformis, Spirijer striatus, var. triplicatus Hall, 8. Rocky-Mon- 
tanus, S. lineatus, Terebratula subtilita, T, plano-suleata, T. Royssit, 
I. Utah, Myalina, Nautilus, and spines of Archwocidaris. 
tmay be as well to add just here, that Dr. Owen gives the 
following list of fossils collected by him at this locality, viz: 
Fusulina cylindrica, Productus punctatus, P. Cora, P. costatus?, P. 
From the same outcrop, the writer has now before him (col- 
lected by Dr. Hayden) Productus costatus, or a common form 0: 
ucts Rogersii, together with the Coal-measure form usually —_— 
e- 
bratula Marcou), Zerebratula bovidens Morton, (= TZ. millipune- 
tala Hall), Spirifer Kentuckensis, S. cameratus, an Allorisma, and 
the peculiar Encrinus-like Crinoid already mention 
costa, 
first named, the are very common in our Western Coal-meas- 
MP. ieicitiatns of ides lists is P. tubulospinus of McChesney ; 
Which is scarcely distinguishable from the punctatus. At any 
Tate, it is, as remarked-by McChesney, very common in the Coal- 
measures throughout the Western States.” The same shell 
able doubt, the widely distributed Coal-measure species, P. 
