GEOLOGIC MAP OF THE TULLY QUADRANGLE 



51 



In respect to fossil remains the formation is extremely barren. 

 Plant remains are not uncommon in the black shales and occasional 

 fish plates are also found here, but though in its westward extent the 

 rock carries a number of species of lamellibranchs, brachiopods and 

 cephalopods, these are apparently for the most part absent here. 



Sherburne flags 



This term was introduced by Vanuxem in 1840 for the arenaceous 

 deposits next succeeding the Black or Genesee shale. On this quad- 

 rangle the division attains a thickness of 210 feet and at the bottom 

 consists of soft gray shales with thin layers of interstratified dark 

 shale and thin flags. An uneven layer of bluish sandstone 1 to 2 feet 

 thick occurs 25 feet above the top of the Genesee and is overlain by 

 6 to 8 feet of sandstone layers separated by gray shale; a bed 8 feet 

 thick of gray and olive shale next above is overlain by a compact 12 

 inch sandstone. The remainder of the formation is composed of 

 hard gray shales and thin sandstones, the latter becoming more fre- 

 quent and heavier toward the top. These rocks are exposed in their 

 lower part at the falls in the ravine 1 mile southeast of Vesper and 

 the upper beds are exposed in the upper part of the ravine 1 mile 

 south of Carr's quarry west of Mud lake. The rocks are also seen 

 along the road leading east on the south side of the large gully 3 

 miles south of Tully and in the ravine and by the roadside east of 

 Ousby's old quarry and in King's gulf y 2 mile south of Ousby's. 

 Also in an old quarry on the west side near the head of Shackham 

 brook and in many outcrops along the north slope of Labrador hill 

 and South mountain. 



Fossils are of very rare occurrence in this formation. In a thick 

 layer of sandstone, 115 feet above the base and exposed in King's 

 gulf, was found a mass of Cladochonus and a few specimens of 

 S p i r i f e r m esacostalis, Buchiola speciosa, 

 Tornoceras u n i a n g u 1 a r e , fragments resembling M a n - 

 ticoceras pattersoni, together with Palaeoneilo and 

 crinoid stems. Spirophyton and some plant remains have also been 

 found and some of these species indicate the feeble extension of the 

 Intumescens or Naples fauna eastward. The Sherburne flagstones 



