196 The Amerivaii Geologist. September, i89a 
Presentation of samples from the salt mines of New York. By S. A. 
Lattimore. 
The mining, metallurgical, geological and mineralogical exhibits to be 
shown at the World's Columbian Exposition. By Geo. F. Kunz. 
Cerro-Vlejo and its cones of volcanic ejecta and extrusion In Nicara- 
gua. By .John Crawford. 
Paleobotany of the Yellow Gravel at Bridgeton, N. J. By Arthur 
Hollick. 
Pleistocene geography. By W.J. McGee. 
Distribution of the LaFaj^ette formation. By W. J. McGee. 
[Submarine vallej^s on Continental slopes. By Warren Upham. 
Cenozoic beds of the Staked Plains of Texas. By E. .0. Cope. 
The Homotaxic relations of tlie North American Lower Cretaceous. 
By Robt. T. Hill. 
Exhibitions of Guelpli fossils found in Rochester, N. Y. By Albert L. 
Arey. 
The American Mastodon in Florida. By John Kost. 
Some problems of the Mesabi iron ore. By N. H. Wincliell. 
The mathematics of mountain sculpture. By Verplank Colvin. 
In Section H. , Mr. AY. J. McGree read a valuable paper on 
"Comparative Chrouolog}', "" the principal points of which were to 
greatly lengthen the accepted period of geological history,particular- 
ly the later portion of it, but to shorten the period of human history. 
Mr. McGee objects decidedly to all supposed evidence of man in 
Tertiary time. It seems likely that the term ' 'Tertiary" as applied to 
human remains in central P]urope,has been misunderstood, and that 
the term is meant to designate, at least in some cases, simply the 
surface deposits which have more lately been denominated drift. 
Mr. W. H. Holmes, who pi'esided over Section H. , objects to 
the terms "paleolithic" and "neolithic," as commonly employed to 
denote human implements of different dates and states of culture. 
He has found both in great abundance in the stone quarries of the 
ancients in Arkansas. The "paleolith" is the unworked "stock of 
the quarry," and as such was cached in quantities, or carried to 
great distances. The "neolith" was made at leisure, and as the 
occasion demanded, the same or similar "paleoliths" being 
wrought sometimes into one tool and sometimes into another. 
According to Prof. E. D. Cope the "staked plains" of Texas 
are composed of Cenozoic strata, divisible into Equus beds, Blanco 
Canon and Lokj) Fork, the last being lowest, confirming the de- 
terminations of Prof. Hill. They are underlain by Triassic. The 
Equus beds have a well-known vertebrate fauna. The same is 
true of the Loup Fork. Between these faunas, which are totall}' 
separate and distinct, existed a paleontologic blank, which has now 
been filled by the discovery of the Blanco Canon beds. There are 
no marine forms either in these beds of the staked plains, or in 
the Triassic or Permian below. He considers the Equus beds as 
probably of the age of the LaFayette, but that is based wholl}' on 
paleontologic evidence. 
Prof. Cope obtained remains of Megalonyx in the Blanco Canon 
beds, and several species of Fquiis in the Equus beds. He made 
Si rich and varied collection of vertebrate remains. 
