I 



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Association of American Geologists and Naturalists. 143 



past years. Thus Dr. Percival in his report on Connecticut, has describ. 

 ed and mapped the mesozoic red sandstone of that state in detail, afford. 

 mg much minute local information concerning the numerous trap dykes 

 wh.ch mtersect it. Prof. Mather has in like manner in his report on 

 £ew lork shown its boundaries and structure in Rockland county. To 

 Prof. Hitchcock we are indebted for a paper printed in our Transac- 

 tions, describing five new and interesting species of ancient bird tracks 

 in the same formation in the Connecticut valley, together with several 



Assoc 



thanks 



, -»«« « ■■» ■■■ "iuuc iuai ^CCU ill IXLUdLliy Oil 



the fishes and bird tracks discovered by him in the same formation at 

 Pompton, New Jersey. From Prof. William B. Rogers we have learned 

 toe existence of the Posidonia Keuperi in this rock in Virginia, a fact 

 almost decisive of the European affinity of the formation. He has also 

 |n a paper printed in our Transactions settled with considerable exacti- 

 _ e the age of the interesting coal rocks of eastern Virginia. The 

 mnts of the mesozoic red sandstone (new red) in North Carolina hare 

 <*en described and mapped by Prof. Elisha Mitchell of that state. 

 ■ 1 r - Lyell will probably enlarge our knowledge of the foreign affini- 

 «s of the Cretaceous strata of New Jersey, the Carolinas and Georgia, 

 7 a comparison of the fossils procured by him in this country with those 



skiiin Cretaceous groups of Euro P e ' Dr ' Morton t0 whose P atient and 



indeb lnVeSt ' gation of the cretaceous fossils of this country we are 



visb t6d f ° r the ° hicf Part ° f ° Ur faCts res P ectin g tllis interesting di- 



tion° n >, ° Ur - Pa,seontol °gy» nas recently laid us under new obliga- 



leUn if figUr ' ng Somc strikin g forms, collected by the lamented Nicol- 



m l >e remote and vast cretaceous region of the Missouri. At the 



ske ™ eetln S of t} ie Association Mr. Nicollet himself, read an interesting 



ne cretaceous beds, examined by him on the Missouri river. 

 ur acquaintance with the cainozoic or tertiary strata of the United 



^k. i ^^ ^™ ^™ ^^^^r ^^^^F ^^V^B ■ i g % ■ ■ ^^^p ■ W ■ r ^fc M t — ■ ■ m m m ^H ■ w \ X ^h 1 i ft M ^t^* ^ h r ft. M ^L J ■ J 



as also been materially advanced in the interval under consider- 



tIOn - Mr Pn a • 



in 1841 ' a ln a communication to the National Institute, made 



am ' aS P resente d a clear and interesting synopsis of his researches 

 state e tertlary beds of some P arts of Maryland, and of the southern 

 fribu/r? Lyell in two papers to the Geological Society, has con- 



&nd P Vanous use fal facts concerning the same strata in the Carolinas 

 Associ e ° rgla and ^ Martha ' s Vi neyard. Mr. Hodge has also given the 

 c reta ** S observat i° ns on some parts of the southern tertiary and 

 c °nsid rata - The list of miocene fossils of Virginia, has been 



erably enla rged by Mr. Henry Lea of Philadelphia, in a paper 



