16G 



SECTION OF UTICA ALONG CRICHTON STREET, RlDEAU. 



STRATA HORIZONTAL IX DESENDIXG ORDER. 



Superficial deposits, road metal, &c. (Recent). 



Utica Formation. 



Band of impure nodular argillaceous limestone belonging to the 

 Utica formation. 



Series of thin and soft brittle shaly strata, with occasional rounded 

 concretionary masses of various sizes distributed in the softer ma- 

 terial. _^^_ 



Band composed almost exclusively of impure nodular lime- 

 stone, arranged in irregular masses separated by shaly or argillaceous 

 material. 



Shaly strata, apparently destitute of nodular or concretionary 

 masses, cleavage planes in the shales at right angles to the planes of 

 stratification. 



Baud of partially disintegrated nodular limestone. 



Series of very soft earthy strata, most probably shaly at one time, 

 jut deprivf d of its cementing materials. 



Band of dark-grey, hard, compact, impure limestone, not so 

 bjtuminous as beds in lower part of this section, nodular and conore 

 tionary in certain portions which are probably bo disintegrated as to 

 point out the lines of conehoidal fractuie in which the beds would 

 break. Rhombohedraof calciteare rather abimdautin numerous veins. 

 Bed holiing Asaphiis C(ina(ff7isis, Chapman ; Triarthrux Becki, Green 

 Leptcena sericea, Shy ; Orthis testudiiiaria Dalman ; Lfptobolus and 

 Lingula, &c. 



Dark brittle and bituminous shales, very thin and fissile, hold- 

 ing abundant remains of the ubiquitous shell Lepta-na sericea, 

 Sowerbv. 



Band of light-weathering, dark, bituminous limestone, in which 

 were found the remains of Bucania cxjiansa, Hall, and Leiptiena sericea, 

 Sowerby (a rugose variety of the latter). 



Note. Proceeding in a northerly direction, along the same street, 



the above bed, of which only ten and a half inches are exposed at the 



bottom of the trench where the section was taken, may be seen to 



crop out on the surface of the ground, opposite house No. 101, where 



the following section was observed : 



Additional five inches of dark, impure, bituminous limestone 

 similar to above, disintegrating in certain jiortions of the band. 



Hard, compact, dark, impure, bituminous shales or shaly lime 

 stoue, holding abundant fossil remains : 0. testudinaria, Dalman ; 

 Leptienu sericea, Sowerby ; Endoceras Proteiforme, Hall, &c., &c. 



Seriesot black, bituminous shales teeming with fossils, typical of 

 the Utica formation : LepUvna sericea, Sowerby ; Strophomena allernata, 

 'Conrad ; Orthis testudinaria, Dalman ; Zygospira Ileadi, Billings ; 

 Lyroicsma pulcheUurr', llaM; Endoceras Pioleijorme, Hall; Asaphus 

 Canadensis, Chajmian, &c., .Ic. (base of section)". 



4 inches. 



Impure 

 limestone, 

 3 inches. 



Soft, brittle 

 shales, 

 14 inches. 



Impure 

 limestone, 

 8 inches. 



Shales, 

 IH inches. 



limestone, 

 6 inches. 



Soft, earthy 

 strata, 

 10^ inches. 



Impure 

 limestone, 

 6 inches. 



Brittle 

 shales, 

 3 inches. 



Bituminous 

 limestone, 

 10^ in., 

 (plus). 



5 inches. 



Imp. shales 

 or limestone, 

 2 ft. 1 in. 



Bituminous 



shales, 

 4 inches, 



(plu,). 



