BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



VOL. 11, PP. 449-454, PL. 40 JUNE 22, 1900 



VERTEBRATE FOOTPRINTS ON CARBONIFEROUS SHALES 

 OF PLAINVILLE, MASSACHUSETTS 



BY J. B. WOODWORTH 



(Presented before the Society December 30, 1899) 

 CONTENTS 



Page 



General geology of the area 449 



Condition of strata and fossils 449 



Distribution of metamorphism 450 



Structure of the Wrentham-Attleboro area 450 



Geology of Plainville ■. 450 



Distribution and character of the strata 450 



The Blake Hill fault-block 451 



Rainprint horizons 452 



Footprints 452 



Description of the Plainville tracks 452 



Distribution of footprints in eastern Carboniferous areas 453 



Conditions under which footprints were made 453 



Geology of the Area 

 condition of stra ta a nd fossils 



The footprints described in this paper were found in the northwestern 

 corner of the Narragansett basin after a report on this region by Messrs 

 Shaler and Foerste and the writer had gone to press.* In this report it 

 is brought out that a small part of the Narragansett basin is not more 

 metamorphosed than the Paleozoic rocks of the New York state system, 

 and that in this tract the conditions for the preservation of fossils are 

 peculiarly good. In the region to the south and east the Carboniferous 

 strata have been folded, and particularly toward the south metamor- 



* Monograph xxxiii, U. S. Geological Survey, Washington, 1899. Footprints noticed in postscript 

 on page 98. 



LXIV— Bull. Geol. Soc. Am., Vol. 11, 1899 (449) 



