OLAF HOLTEDAHL. [SEC ARCT. EXP. FRAM 



limestone-conglomerates, and above these beds of limestone. In loose 

 pieces of Ibis latter rock were found fragments of a Ptychoparia, probably 

 a iif\v -prrif.-. v.-l too incomplete to be specifically determined. The form 

 indicate Middle or Upper Cambrian. 



Above the limestone again come limestone-conglomerates and a 

 yellowish-white limestone, 100 m. thick. Here were found fragments of 

 trilohiles, Ptychoparia sp., llhcnurns sp., besides numerous but very 

 badly preserved O/'Moceras-specimens. Still higher were found beds of 

 quart/, -nndstone alternating with limestone, and finally a 30 m. bed of 

 limestone, where also traces of fossils were found, badly preserved gastro- 

 pods. among others an incomplete specimen of a Madurea, and a frag- 

 mentary pygidium, belonging to a Bathyuriscus or Ptychoparia form. 



1 he stratigfaphic position of the two fossiliferous limestones just men- 

 tioned is, in all probability to be found near the Cambro-Ordovician boundary. 

 in the highest Cambrian or basal Ordovician, the Ozarkian of ULRICH. 

 The total thickness of the above-mentioned sediments, which may be easily 

 studied on the east coast of Bache Peninsula, is not less than 7 800 m. 



Limestone beds with a distinctly younger fauna, are found in Norman 

 Lockyer Island, 18 km. to the north of Victoria Head. Here the following 

 species in well-preserved specimens were found. 



Halysites catemdaria var. gracilis HALL. 

 Calapcecia canadensis BILLINGS. 

 Streptelasma corniculum HALL. 

 Mesotrijpa cf. discoidea var. orientalis BASSL. 

 Callopora angidaris ULRICH. 

 Rdfinesquia dt'ltaiden Cox. 

 Plectambonites sericea Sow. 

 Ortliis tricenaria CO.NH. 



Rhynchonotrema hxri/nirahns CASTELX. 

 Trochonema cf. umhilicdtnm HALL. 

 Gonioceras occideiitale HALL. 

 Tltuleops ovata CKMI. 

 \ilens (BtoiHt.stns ?) sp. 



fabuliles CONR. 



This fauna it undoubtedly of the same age as the bulk of the forms 

 desciilifd by SCHUCIIKKT from Silliman's Fossil Mount, Frobisher Bay, 1 

 belonging to early Trenton. 2 



1 On tli- lower Silurian (Tienton) Fauna of Baffin Land. Proe. U. S. Nat. 



\IiiM-iim XXII. r.MIII, and furllier: Nnloon Arctic Paleozoic Fossils. Am. Journal 



of Si-i.-nn- XX XVIII. I'.MI. ,,. H2. 

 3 In WILLIS: Slniti^rapliy of Norlli America, p. 217, ULRICII in a note considers 



UK- liori/oii nl Sillimans K.^.sil Mount to belong to upper Black Hivcr. 



