202 INDEX TO THE STEATIGRAPHY OF NORTH AMERICA. 



[Part of] synoptical table of the geological formations about Quebec City, Quebec. 



System. 



Ordovician. 



Formation. 



Lorraine . 



Utica. 



Trenton. 



Black River 



Quebec. 



Levis. 



Character of strata, etc. 



Buff-weat h e r i n g fine- 

 grained magnesianand 

 arenaceous shales and 

 limestone bands. 



For the most part dark- 

 brown and buff- 

 weathering or black 

 bituminous shales and 

 thin bands of lime- 

 stone. 



Thin and evenly bedded 

 fine-grained and light- 

 gray compact lime- 

 stones, with thin shaly 

 bands interstratified. 

 Marine and fossilifer- 

 ous; used for building 

 purposes. 



Heavier-bedded coarser- 

 grained and in part 

 dark-weathering im- 

 pure semicrystalline 

 limestones, fossilifer- 

 ous. 



Hard compact cherty 

 and calcareous bands, 

 dark-brown or black, 

 more or less thick beds 

 of bituminous shales, 

 limestone beds, and 

 evenly bedded con- 



flomerates and bands 

 olding arenaceous 

 material. Fossilifer- 

 ous throughout; much 

 disturbed and faulted, 

 folded, and consider- 

 ably altered, slicken- 

 sided, etc. 

 Dark-gray and brown 

 and black carbona- 

 ceous shales with lime- 

 stone beds and con- 

 glomerate bands, also 

 light yellow colored 

 dolomites. Fossilifer- 

 ous throughout. The 

 light yellowish gray- 

 limestone often semi- 

 crystalline, much fold- 

 ed and faulted and oft- 

 times slickensided. 



Characteristic fossils. 



Orihograptus quadrimucrona- 

 tas H., Diplograptus hud- 

 sonicus Nicholson, Am- 

 honychia (Byssonychia) ra- 

 diata H., Orthodesma paral- 

 lelum Hall, Trinucleussp., 

 Modiolopsis, and Bellero- 

 phon. 



Leptobolus insignis Hall, 

 Sckizocraniafilosa Hall, Ser- 

 pulites dissolutus 3ill., Tri- 

 arthrus bechi Green, Asa- 

 phus latimarginatus Hall 

 {=A. canadensis Chapman) . 



Prasopora selwyni Nicholson, 

 Discina pelopea Billings, 

 Plectambonites sericea Sow- 

 erby, Rafinesquina alter- 

 nata Conrad (Emmons), 

 R. deltoidea Con., Dalma- 

 nella testudinaria Dalman, 

 Protowarthia eancellata 

 Hall, Calymenesenaria,Con- 

 rad, Trinucleus concentricus 

 Eaton. 



Ambonychia bellistriata Hall, 

 Trochoceras halli Foord, 

 Trochilina ami Jones,Illx- 

 nus milleri Billings. 



Diplograptus angustifolius 

 Lapw., Climacograptus bi- 

 comis Hall, Dicranograptus 

 ramosus H., Dicellograptus 

 anceps, Paterula amii 

 Schuchert, Corynoides caly- 

 cularis Nicholson, Shumar- 

 dia granulosaf Billings, 

 Bathyurus caudatus B., 

 Aeglinaredeviva or n. sp., 

 Remopleuridesf schlotheimi 

 B., Primitia logani Jones, 

 Aparchites mundulus Jones . 



Tetragraptus quadribrachia- 

 tus Hall, T. serra Brongni- 

 art(=r. bryonoides Hall), 

 T. bigsbyi H., T. approxi- 

 matus Nicholson, Clono- 

 graptv^flexilis Ji&ll, Dicho- 

 graptus odobrachiatus H., 

 Phyllograptus typus Hall, 



, Goniograptus selwyni Ami, 

 Trigongraptus ensifoTTnis 

 H., Diplograptus dentatus 

 Bgt. (=D. pritiniformis 

 H.), Holograptus amii 

 Lapw. (MS.), Dictyograp- 

 tus dawsoni (=2). delicatu- 

 la Dn.), Lingula quebecen- 

 sis Billings, Elkania desi- 

 derata Biii.jSerpulites wes- 

 toni n. sp., Shumardia gra- 

 nulosa Billings. 



Thickness. 



Several hundred feet 

 thick. Between 700 

 and 900 feet (719 feet, 

 Logan). 



Estimated at between 

 250 and 300 feet (318 

 feet, Logan). 



About 300 ieet to 400 

 feet. Onljr a few feet 

 observed in various 

 outcrops overlying the 

 Archean. 



About 75 feet exposed. 



Several hundred feet in 

 thickness. The precise 

 figures not yet ascer- 

 tained. 



Several hundred feet in 

 thickness. The pre- 

 cise thickness not as 

 yet ascertained (about 

 1,400 feet). 



