Permo-C arhoniferous Ammonoids of the Glass Mountains 21 



southward the shales which belong to its upper portion are very well 

 exposed and enormously fossiliferous. They contain a characteristic 

 Pennsylvanian fauna. Ammonoids are rare; the principal species 

 which was found and which will be described in the palaeontological 

 part of this work is Schistoceras J. P. Smithi n. sp., similar to Sch. 

 Hyatti Smith. Furthermore, we collected a small globose involute 

 ammonite which seems to belong to Stacheoceras or Marathonites., 

 and a fragment of a large ammonoid with simple sutures which be- 

 longs apparently to a new genus but is too incomplete for a description. 



Lately Dr. J. W. Beede has made a provisional study of the faunas 

 contained in the Gaptank formation and to him I am indebted for 

 the following review, which I reproduce verbatim: 



"A cursory review of the invertebrate fossils of the Gaptank forma- 

 tion, with provisional identifications, shows an interesting succession 

 of forms from the base upward, and shows also that the formation 

 covers a large span of the Pennsylvanian system of rocks. From the 

 lowest part of the formation — really series — we have such fossils as 

 Cryptacanihia cf. compacta W. and St. J., Chonetes mesolobus N. and 

 P., and Pugnax rockymontanus (Marcou) with fossils usually asso- 

 ciated with this fauna ; to these it is important to add others belonging 

 to the lower and middle part of the formation, such as species of Het- 

 erocoelia, Coelocladia, and Wewokellaf; three species of Com- 

 posita, two of which have Guadalupian affinities, Spirifer aff. mJusak- 

 heylensis Dav., Uncinulus aff. Wangenheimi Tschern., Chaenomya 

 leavenworthana Meek, Porcellia, and others. Many additional species 

 are common to the rocks of the Kansas section or are closely related 

 to them. The Fusulinae of the lower part of the formation (however 

 much of it this may include) seem to be those of the "Upper Coal Mea- 

 sures" below the top of Stage G of the Kansas section-. The basal part 

 of the formation, however, must go as low as the vicinity of the Pawnee 

 or Fort Scott limestone of the Kansas section as is shown by the first 

 four species named. The upper limit of the lower part of the forma- 

 tion, as represented by the collections, probably reaches up to or into 

 Stage G of the Kansas section. 



"The upper part of the formation contains a species of Schwagerina 

 probably identical with the Kansas species, Fusulina sp. very closely 

 related to F. longissimoidea Beede, of the same horizon as the Schwag- 



