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



remainder brachiopods and trilobites. The most diagnostic 

 graptolite is Diplograjptus dentatns (Brongniart), but the 

 most abundant ones are species of Dictyonema. The striking 

 trilobites are Shumardia granulosa, Midymionia meeki and 

 Holometopus angelini, all of which were described by Billings 

 from this locality and horizon. This layer was called by the 

 late T. C. Weston the " Shumardia limestone," a name which 

 it well deserves. It is not easy to get the fossils in place, but 

 many can usually be obtained from pieces of the limestone 

 which have fallen to the base of the cliff. 



About half way between Begin's Hill and the railroad 

 station at Levis there is a flight of steps by which one may 

 ascend to the upper part of the town. At the base of these 

 steps, at the right hand side of them as one faces the bluff, one 

 may see thin-bedded, light gray limestone, and at the left hard 

 green shale with thin black seams. This limestone contains 

 Shumardia granulosa, and the shale above it is full of Diplo- 

 graptus dentatns, Climacograjptus, etc., showing that these are 

 the same strata as those at the top of the bluff at Begin's Hill. 

 These strata can be traced in the face of the bluff into the 

 well-known anticline on Davidson Street, where one finds the 

 following section, showing the strata above the top of the sec- 

 tion on Begin's Hill : 



Section above anticline on Davidson Street. (Numbers and measure- 

 ments continuous with the preceding.) 



19. Thin-bedded limestone, some conglomerate, 

 and shale partings. Shumardia granulosa 

 and other characteristic fossils present. 30 ft. 



20. Interstratified limestone and shale, the shale 

 carrying graptolites, Diplograptus dentatus 



being abundant and characteristic 49ft.= 457 ft. 



21. Hard black and gray shale 80 ft. = 537 ft. 



22. Concealed 20 ft. = 557 ft. 



23. Red and green shale 10 ft. = 567 ft. 



24. Limestone conglomerate with large limestone 



pebbles ._. 10ft.= 577ft. 



25. Red shale 15ft.= 592ft. 



P'rom this point the section is concealed for a short distance, 

 then follow dark gray shales in which the dip reverses, indicat- 

 ing the middle of the sycline. 



These two sections combined include all the strata at Levis 

 which can at present be definitely placed. The heavy con- 

 glomerates west of the cemetery at St. Joseph de Levis are 

 now thought to belong lower in the section, but the structure 

 is so obscure that it is not possible to be certain till an accurate 

 topographic map is available for plotting the outcrops. 



It will be noted that the lower part of the section at Begin's 

 Hill is concealed by the river and the railroad. It is possible, 

 however, to trace the rusty conglomerate, which in this section 



