272 THE PICTOU COAL FIELD — POOLE. 



of tlie New Glasgow and Stellarton road ; but now, on tlie same 

 rill, the overflow from Blackwood's dam close to the road has 

 clearly laid bare the line of contact and the unconformity. The 

 base is a close grained fine grey and mottled red sandstone much 

 brecciated. Its dip is N. 55° E. 45°, and its smooth eroded 

 surface appears to have an average inclination to the northward 

 of about 15°. If this inclination can be taken as correct it 

 is ([uite possible that some of the seeming high dips, 30° and 

 40° in the superimposed conglomerate, may be due to false 

 bedding. 



At the imperfect exposures higher up the dips of the underly- 

 ing sandstones were noted as N. 20° to 60° E. 10° to 25°, dif- 

 fering somewhat from Mr. Hartley's figures,*^^ but the discrej^anc}'- 

 only goes to confirm the statement that they are much disturbed. 



Intermediate but somewhat south of these two points near the 

 athletic grounds red and grey sandstones of the same age dip 

 S. 16° W. 30°, then at a distance of only 12 feet east at S. 2° 

 W. 00°, and at 36 feet further at S. 25° E. 65°, on the maro-in 

 of the great North fault which here brings them in contact with 

 black shales, fireclays and two small seams of coal, beds of tlie 

 Productive Coal Measures. 



Whatever may be the true horizon of these disturbed sand- 

 stone beds, they were consolidated, elevated, dislocated and 

 denuded prior to the deposition of the conglomerate and they 

 supplied the major part of the well rounded boulders and peb- 

 bles that compose the deposit at this point. Such an unconfor- 

 mity must mark a very protracted break in the sedimentation,^- 

 and no such break occurs between the base of the Millstone Grit 

 and the Upper Coal Measures. 



Note. —Since the above was in type a quarry has been opened at a hitherto obscure contact on 

 the left bank of the brook 16 chains above Blackwood's dam. The surface of contact has a general 

 dip of N. 60° E. 55° almost the same as that of the unconformable subjacent bed*. These beds the 

 quarry has shewn to be identical seeming-ly with the greenish grey sandstones of a (piarry on the 

 Meri^oniish road 140 chains east of the river and the suirgestioni that they differ is abandoned. 

 Their underlyinof beds are mottled red from percolations from associate beds of chocolate arena- 

 ceous shales, and the right bank of the brook supplies fragments of dark reddish brown sandstones 

 similar to those of the pass from the V^ale to Pine Tree besides a band of black limestone, the dis- 

 tinctive rock of Pine Tree Section. This identity of base on both sides of the river may be said to 

 prove the unconformity in doubt on the east side, bringing as it dons the conglomerate in contact 

 at the new quarry with beds some distance from its base at thi" older quarry on the Merigouiish 

 road The concluding paragraph under the heading Lower Carboniferous, page 261, should bo 

 deleted, and so also the words " possibly Lower Carboniferous'' referring to this spot on page 240. 



(1) Report 1869, p. 66, also referred to by Logan, p. 13. 



(2) Acadian Geology Supplement, 1S7S ; page 39, line 4 ; paje 49, line 3. 



