THE PICTOU COAL FIELD — POOLE. 821 



discovered 400 yards below the adit, has leen assumed to be the 

 equivalent of the overlying Captain seam of the Marsh pit group . 



Under the coal of the adit there is a calcareous underclay 22 

 inches thick containing shells. This limestone pavement distin- 

 guishes this seam from all others, and is found under the several 

 patches worked on the south side of the brook. It is also found 

 under the coal of the George McKay slope and the McLeod pit 

 near the Marsh pit, and hence may I e considered to confirm the 

 opinion of Sir William that the seams on Potter's brook are 

 the extensions of the Marsh pit group, disturbed by laterals of 

 the North fault The intervening ground has for a base the 

 strono- sandstone beds that form tlie hio'li land eastward from the 

 east corner of the Albion area to Black springs, and it is probable 

 coal will yet be found along this range in which there are crop- 

 pings of several bands of black shales. The sandstone bed 

 referred to appears to belong to the horizon of the heavy sand- 

 stones that either curved or broken cross McLellan's brook 

 below the Widow Chisholm seams and course towards McGregor's 

 mountain. Logan on page 43 says he has no evidence of the 

 effect northward beyond Black's mill site of the supposed Mill- 

 road fault, but we now know that a series of exposures along 

 the contiguous highway crossing the assumed northerly extension 

 of that fault line indicate the passage of a crest of a gentle anti- 

 cline east and west which repeats to the northward the lower 

 members of the sandstone series that immediately overlie the 

 great mass of black shales of McLellan's brook. 



Immediately over the seam at Eraser's Adit a bed of black 

 bat is full of impressions of ferns, fish teeth and scales.* A 

 similar shale occurs on the south or opposite side of the brook, 

 and also higher up on the branch of the brook from the eastward, 

 but the presence of coal below it has not been proved Above it 

 the Lawson slope dipping due south worked a three feet 

 eight inch seamf to a depth on the slope of 200 feet, and on 

 either side for some 8 chains. On all sides the coal was again 

 brought to the surface by faults, and a repetition of this seam, 



t Analysis is given, p. 391, Geol. Report, 1869. 

 *Can. Nat., 1860, p. 8. 



