Raymond — Succession of Faunas at Levis, P. Q. 527 



is numbered 1, for a half-mile north along the railroad, to a 

 small cutting, which may easily be recognized, as it is the only 

 one in this vicinity in which there is a shale on both sides of 

 the track. The rusty conglomerate is not continuous through 

 this half-mile, but is, as is explained by the writer in 

 Guide Book No. 1 of Excursion Al of the 11th International 

 Geological Congress, twice faulted and pushed to the south. 

 That it is the same conglomerate seems, however, to be quite 

 certain, as it has peculiar lithological characters not shared by 

 the other conglomerates of the region. 



In the small cutting above referred to and about 20 feet 

 above the rusty conglomerate, is a line-grained black shale 

 which contains many beautifully preserved specimens of a few 

 species of graptolites. Clonograptus flexilis and C. rigidus 

 are the most important species. About 30 feet higher in the 

 section is a hard dark gray shale, in which the long form of 

 Phyllograptus typus is particularly abundant. Only a few 

 other species have been found in this zone. 



In the guide book referred to above, the writer has stated 

 that the lower of these graptolite zones is about 100 feet below 

 the conglomerate, which in the section on Begin's Hill is No. 

 15. This is the actual field position, but now that the measured 

 section has been compiled, it becomes evident that the faulting 

 has obscured the real relations. The cross faults above referred 

 to have carried the rusty conglomerate further than the con- 

 glomerates above, thus mashing it into the shales and greatly 

 shortening the section. The true position of the zone with 

 Clonograptus rigidus, which may be called A, is probably 

 nearly 200 feet below the thin-bedded limestone which forms 

 zone 5 of the Begin's Hill section. Unfortunately this is the only 

 outcrop of the Clonograptus beds now known, and its location 

 with regard to the D. bifidus zone will have to remain a matter 

 of estimate for the present. The Clonograptus zone is, how- 

 ever, considerably below that of Dldymograptus. 



The sections given above show that fossils are distributed 

 through a thickness of nearly 500 feet- of strata at Levis, and 

 that four faunules may be recognized, the lower two confined 

 apparently to a very narrow vertical range, while the 

 upper two range through a (relatively) considerable thickness 

 of strata and are capable of division into sub-faunules. For 

 the convenience of the subjoined table, these zones may be 

 known as A, B, C, and D. 



A is the lowest zone with Clonograptus flexilis and C. 

 rigidus, Tetragraptus quad rib rachiatus, T. serra and T. 

 approximates. 



B is the next higher zone with Phyllograptus typus, Tetra- 

 graptus quadribrachiatus and Dichograptus octobrachiatus. 



C is the Didymograptus zone, which may be subdivided 

 into three sub-zones : 



