36o 



1,200 to 2,060 feet (365 to 628 m.). After passing through 

 a thickness of overlying formations usually amounting to 

 about 350 feet (107 m.), they enter the Albert series, of 

 which a maximum thickness of 1,800 feet (548 m.) has been 

 penetrated without encountering any signs indicating the 

 approach of the base of the formation. 



The strata of the Albert series, as found in the various 

 wells, consist mainly of thinly-bedded, shaly beds, usually 

 black or dark green in colour and varying in composition 

 from argillite to limestone. Besides the shaly strata, fine- 

 grained quartzose sandstones are comparatively common, 

 the number of individual sandstone beds in a single well 

 varying between 3 and 15. In thickness the individual 

 sandstone beds vary from a few feet to 100 feet (30 m.) or 

 more. There is a rather general tendency for the sandstone 

 beds to occur in groups, in a number of instances three 

 such groups separated by intervals of 150 to 350 feet of 

 shales (45 to 106 m.) being encountered in a single well. 

 The aggregate thickness of a single group of sandstones 

 may rise to 180 feet (55 m.), but more often lies between 3 

 and 90 feet (9 and 27 m.). The individual beds of a group 

 of sandstones may be separated by shaly layers varying in 

 thickness all the way from a few feet to 30 feet (9 m.) or 

 more. 



Though slight traces of oil or gas have been found in the 

 shaly beds and, in one instance, in strata overlying the 

 Albert series, the oil and gas are confined, practically, to 

 the sandstone beds in the Albert series. In the case of one 

 well which the drillers recorded as apparently passing 

 through disturbed, broken strata, practically all the sand- 

 stones are free from oil or gas. In the producing wells, a 

 small number of sandstone beds do not afford any trace of 

 oil or gas. Usually the number of such dry beds is small in 

 comparison with the total number of sandstone beds in a 

 well; and the dry beds, as a rule, occur towards the top of 

 the well, but such beds are also recorded as occurring 

 beneath others with showings of oil or gas. Usually by 

 far the greater number of the sandstone beds are recorded 

 as at least showing oil or indicating the presence of gas, 

 and in some of the wells, sandstone beds of two different 

 horizons yield large volumes of gas. 



In the case of about one-half of the number of the wells, 

 all the sandstone beds (except such as are dry) of each well 

 are recorded on the logs as being either all oil sands or all 



