156 AJ^'NALS NEW YORK ACADEMY OF SCIENCES 



. . . Hatcher was the first to distinctly point out that the uppermost 

 part of the beds might include a part of the Lower Cretaceous. . . . 



"I am strongly of the opinion that these deposits, nowhere, so far 

 as known, exceeding a thickness of 500 feet, really represent various 

 epochs between the Jurassic and the Upper Cretaceous, and that sooner 

 or later we shall have evidence to distinguish the later from the earlier 

 faunas. . . . 



"The upper part of the Atlantosaurus beds is, it seems to me, indis- 

 putably Cretaceous; the lowermost part is probably not older than the 

 Wealden, though possibly of Purbeckian age. I therefore strongly pro- 

 test against the common usage of referring all the fossils from these beds 

 to the upper Jura. Until more is known of the different faunas con- 

 tained in it, the only proper designation for the composite faunas in- 

 cluded in them is Jura-Cretaceous; this assumes that the Wealden is 

 really Jurassic." 



A sauropodan coracoid was discovered by Larkin (1910, 2) in the 

 Trinity formation in Oklahoma. There is no Morrison present at this 

 locality, but it is possible that the bone had been transported some 

 distance. 



Berry (1911, 7) has discussed the three divisions of the Potomac for- 

 mation and their floras at some length, and has shown that the floras of 

 the Patuxent and Arundel beds, which have many forms in common, are 

 closely allied to the flora of the Kootenie formation. "The two floras 

 [Patuxent- Arundel and Kootenie] have a great many elements in com- 

 mon, and upon the basis of the floras alone the conclusion would be 

 reached that the base of the Kootenie was approximately the same age 

 or slightly older than the base of the Patuxent." The Patuxent forma- 

 tion, however, which contains a larger flora than the Arundel, lies below 

 the Arundel, which contains the Morrison fauna. In the west this con- 

 dition is reversed ; the Kootenie, which contains a flora very closely allied 

 to that of the Patuxent- Arundel series, lies above the Morrison with its 

 fauna. This relation is shown by the following diagram : 



Arundel (plants and bones; Kootenie (plants) 



ratuxent (plants') Morrison (bones) 



The conclusion seems to be that the Kootenie and Morrison aie practi- 

 cally the same thing, and that the Patuxent and Arundel are very closely 



