254 



Besides affording good sandstone and limestone for building pur- 

 poses and also flagstones for paving; the Chazy foriuafcioa about 

 Ottawa affords good hydraulic cement. On lot 34, Con. A, Nepean, 

 Mr. 0. B. Wright has opened a large quarry in three be Is lying close 

 tc one another in the uppermost part of this formation, and for years 

 ])ast has obtained a large quantity of a magnesian limestone having a 

 marked conchoidal fracture and often containing small cavities lined with 

 pink calcite crystals. Higher up the river and oa the line of strike of 

 the above mentioned exposure the same beds were noticed at several 

 places, whilst in the " Geol. of Canada," 1863, page 80G, it is stated 

 that they are continuous from Alluniette Island. to Hawkesbury, a dis- 

 tance of over 100 miles. The cement, known commercially as the 

 " Hull Cement " and manufactured by calcining this rock with an ad- 

 mixture of clay as the argillaceous constituent required in cprtaiu 

 definite proportions, has been characterized as " a strong and lasting 

 cement" — (see descriptive catalogue of the minerals of CanacU. — Dr. 

 Sehvyn, 1876.) The clays used belong to the post tertiary epoch and 

 «i-e of marine origin, being known as the " Leda Clays." 



There has been a considerable demand for "Hull Cement" in 

 foreign as well as home markets during the [)ast year, upwards of 8,000 

 barrels of hydraulic cement having been shipped from this port whilst 

 there have already been extracted 1,750 loads of cement-sione this 

 ■winter for calcination during the coming season. The cjiaent belongs 

 to that class known as " slow-setting." 



Bini's Eye and Black Eiver Formation. — The measures of this 

 formation about the Petite Chaudiere on the north and south shores of 

 the Ottawa River were visited and a number of the characteristic 

 species of fossils collected, e. g. : Colamnaria llaU'i, (Nicholson), Telra- 

 lUurn fibratn/n (Safford), etc. 



Notes were taken on the much faulted and disturbed strata at this 

 locality which assumes its peculiar orographic aspect on account of 

 faults cutting the measures in a parallel series of steps — whence the 

 I'apids. 



It is very difficult to ascertain in many in.stances the e.xact amount 

 of faulting, yet the exi)osures are most interesting and deserve close 

 studv. 



