1843.] 271 



and these circumstances lead to the supposition that in both in- 

 stances it dips under the sandstone. Between Roe's Point and 

 Campbell's Cove, on the western shore of the Island of Boularderie, 

 the strata are very much broken and disturbed by faults. It would 

 be difficult to describe these disturbances by words ; but the Section 

 will give the most distinct idea of them. Gypsum appears along 

 this line in two places, which are shown in the Section. 



First, to the N. W. of Roe's Point, we have solitary pinnacles of 

 gypsum appearing on the beach. Next, three beds of limestone, 

 with two of sandstone interposed, these beds all dipping in an 

 opposite direction to those at Roe's Point. The middle bed of 

 limestone contains Productus spinosus. The third and upper of 

 these limestones is cut off by a vertical fault, which is succeeded 

 by a flat arch of limestone, resting upon sandstone. This again 

 is cut off by a vertical fault, which is succeeded by a horizontal 

 bed of limestone. 



This is followed by a level space ; and beyond that we have a series 

 of beds dipping in the same direction with those of Roe's Point. 



1 . A thin bed of limestone. 5. Rich marl, 6 feet. 



2. A bed of sandstone. 6. Green sandstone, with veins of gyp- 



3. A thick bed of coarse limestone. sum, 2 feet. 



4. Gypsum, 1 8 feet thick. 7. Red marl, with grains of gypsum, 1 2 



feet. 



This is followed by a level space, when no beds are seen, and 

 beyond that we have limestone, dipping in the same direction with 

 the gypsiferous marls. 



Section IV. 

 Campbell's Cove, near Lime Point. 

 N.N.W. S.S.K. U V, 



Proceeding from Campbell's Cove along the shore of the Island 

 of Boularderie in a south-westerly direction, we have similar lime- 

 stones, lying in a horizontal position, for the space of two miles, 

 until we arrive at Lime Point, where a small cove exhibits three 

 beds of limestone with two interposed beds of sandstone dipping 

 to the S. S. E., and apparently underlying the sandstone with coal- 

 plants ; but separated from it by a space which affords no section. 

 The lowest of the three beds of limestone contains Spirifer glaber 

 (Lyell) ; the middle bed contains shells. 



The writer mentions in his letter to Mr. LyeU that, " on the 

 eastern side of the Sydney coal-field, he has found below the coal- 

 seams, in every instance, beds of fire-clay, containing the long 

 fibrous leaves of Stigmaria, matted together. 



" In the black bituminous Shale, which lies about twenty yards 



