42 GUIDE TO LOCALITIES. 



Sphenopteris duhuissonis Brongniart. 



Pecopteris cistl Brougniart. 



P. serlii Brongniart (=Alethopteris serlii). 



P. punctulata. 



JVeuropteris cf. acutifolia Brongniart. 



iV. cf. sechuchzeri. 



Odontopteris sp. 



More recently, well preserved ferns have been found in the 

 ledges of Carbonian slates between Mansfield and Attleborough. 



Joseph H. Perry in 1885 reported the finding of two specimens 

 of Lepidodendron in the mica-schist which surrounds the granite 

 knoll in the eastern part of Worcester, and which furnishes the 

 Worcester coal. These were identified by Lesquereux as the 

 rare Lepidodendron (Sagenaria) acuminatum Goeppert. 



C. T. Jackson in 1851 reported the finding of Calamites at 

 Bridge water, Mass. 



The following two localities are the only ones readily accessi- 

 ble for the study of our Carbonic fossils. 



ROCKDALE (PONDVILLE STATION). 



Boute.—By rail, N. Y.,N. H. and H. railroad, Providence div. (Park 

 square station) to Pondville station, 23.5 miles; fare $.55. 



This is Crosby and Barton's original locality for Carbonic fos- 

 sils in the Norfolk County basin. The fossils occur in a small- 

 pebbled or arenaceous conglomerate lying near the top of the 

 first or conglomerate series. They consist of moulds of Sigil- 

 laria and Calamites. The moulds are all much compressed, the 

 flattening corresponding in direction with the imperfect cleavage 

 of the rock. The smallest found by the authors was one or two 

 inches in diameter, the largest twenty by six inches on the cross- 

 section. These hollow moulds are usually inclined to the horizon, 

 and some of them have been probed to a depth of twenty feet or 

 more. About thirty specimens were reported by the authors. 



J. B. Woodworth in 1894 examined and confirmed the organic 

 origin of these moulds. He reports that, between the casts (when- 

 ever such IS present) and the mould in the sandstone matrix, there 

 occurs a " limonitic and cellular layer, apparently representing 

 the cortical part of the plant, too poorly preserved for identifica- 

 tion." This layer was observed in many of the hollow moulds. 



