26o THE JOURNAL OF GEOLOGY. 



than most of those of that plant, and indicate that those on this 

 plant, lower down, are somewhat larger than those of G. Zippei. 

 The form is also something like Aspidiiim heterophyllum, of the 

 Potomac, but seems to be smaller and more delicate. It may 

 however be the same. 



" 3. The most common fossils are fragments of detached leaf- 

 lets and one entire leaflet, of a plant which is strikingly like a 

 Neuropteris of the coal measures {^N. flexuosa). I am pretty sure, 

 however, that it is a Glossozamites, a form of cycad that has leaf- 

 lets which, in form and nervation, closely resemble Neuropteris. 

 This, if a Glossozamites, has leaflets proportionately broader and 

 shorter than any known to me, and it is probably new. 



"4. There are a number of imprints left by organisms which 

 in shape, dimensions, etc., would agree with fragments of the 

 leaves of Pinus, or of Leptostrobus, but as nothing of the nerva- 

 tion is shown, it is not possible to say which they are. Some of the 

 imprints are too deep and open, apparently, to have been formed 

 by leaves. They seem to have been straight, slender stems. 



" It will be seen from this account that the plants, so far as one 

 can judge from such imperfect material, indicate a lower Creta- 

 ceous and Neocomian age, with rather more resemblance to the 

 Kome than Potomac phase or grouping, but it is by no means cer- 

 tain that the Potomac grouping is not nearest to that here shown." 



Thin sections of some of the silicified wood have been made 

 and microscopically studied by Professor F. H. Knowlton. He 

 reports the results as follows : 



"The structure of this wood is very finely preserved, and a 

 glance suffices to show that it possesses the Araucarian type 

 and represents, with little question, an undescribed species 

 of the genus Araucarioxylon. The wood-cells are provided 

 with two rows of alternating hexagonal pores on the radial 

 walls, which nearly, or in some cases, quite cover the walls. The 

 medullary rays are composed of a single layer of thin, short cells, 

 each of which is covered on the radial side with numerous fine 

 dots or punctations. The rays are from one to bout twenty 

 cells high, the average number being perhaps eight or ten. A 



