rJ * 
/ru. 
Ii6 Btilletin of Laboratories of Denison University. [Voi. xi. 
and a large Athyris as the characteristic fossils. Four to six 
feet of shale may occur at this point. About 25 feet higher is 
a peculiar greenish layer with a sandy tendency. Still 60 feet 
higher is a definite sand-stone layer often characterized by the 
presence of much feldspar in the sand. This band is about ten 
feet thick and is followed by about 100 feet of gray lime. 
The sandy members are not very constant. The position 
of the zone of bryozoa and Fusulina bed is probably near the 
prominent bed of lime mentioned and, as this is often the ap- 
parent top of the series, the beds are frequently quite acces- 
sible. 
The nature of the transition into the Jura-triassic is still 
obscure. At the north end of the Sandia range is an exposure 
where the transition apparently can be seen. The extent of 
disturbance is however a drawback. So far as can be seen the 
base of the red series is formed by a curious bed of large- 
grained sand or fine conglomerate the grains being red granitic 
fragments. There is also a lime conglomerate. Then a band 
of lime in which is a fauna with a decided Carboniferous facies 
yet with foreign elements. In fact, the appearance is as though 
the Carboniferous fossils were in fragments of the Carboniferous 
limestone while the others were collected with the fragments 
and cemented together. A perfect specimen of Hemipronites 
cremistria with both valves was found. Awaiting the oppor- 
tunity to collect added specimens the age of these beds must 
be left in doubt with the suggestion that they may prove the 
missing Permian. No fossils have so far been found in the red 
beds referred to the Jura-triassic. 
A comparison with the section given by Captain ^ C.| 
Dutton from the Zu/n plateau (Sixth Annual Report of the U. 
S. Geological Survey, 1885,) will show that the fragments of 
the Jura-triassic and Cretaceous encountered in this region are 
insignificant when compared to the great formations to the west, 
for 3150 feet are attributed to the Jura-triassic alone in that sec- 
tion. The work of correlation has hardly progressed far enough 
to make comparisons desirable. 
