DEPOSITED IN WATER. 
53 
of Water crag, is the top of the underset limestone at Crackpot hall ; 
but at east Stonesdale beck it is three hundred feet above Muker. 
Chert lies on the top, as usual in Swaledale ; sixty feet of plate, flaggy 
beds, and gritstones succeed, (the upper grit is called underset grit) ; 
about eighty feet ? of main limestone come above, (here rich in producta 
gigantea and corals) ; then plate, lime, chert, plate, chert, and thick plate, 
for one hundred and twenty feet ; eighty feet of gritstone ; fifty feet 
of plate, black gray and reddish cherts, and plates ; above are six 
hundred and sixty feet of plates, gritstones, plates and coal, to the 
summit of Water crag. 
On the east or Punchard gill side, after passing four hundred feet of 
grits and shales from the summit of Water crag we arrive at the outcrop 
edge of a coal seam, above a coarse grit ; one hundred and seventy feet 
lower are laminated gray, blue, and spotted chert beds, and cellular 
chert, lying in shale and yielding fossils ; about two hundred and forty 
feet lower we reach the top of the main limestone ; one hundred and 
ninety feet lower the base of the underset limestone; then follows a 
succession of gritstones, flagstones, and plates, with one (the middle) 
limestone to the bottom of Arkendale at Seal’s houses, in all two hundred 
and thirty feet. 
Vale of Greta . — In another direction we may rise from Arkendale 
to the narrow pass of the ‘ Cross of Greet,’ and descend into the vale 
of Greta and Teesdale, by Hope, Scar gill, and Greta Bridge. This 
very instructive route gives on the Teesdale slopes exactly the usual 
terms of the Yoredale series, viz. below the gritstone, and plates, 
and cherts of the summit of the pass, main limestone, grits and 
plates, underset limestone, and flagstone series. The latter extends 
for some length up the Greta above Brignall, yielding very capital 
stone, and about Rutherford bridge a lower limestone is exposed 
on the banks of the river. From the Greta the general dip of the 
country is northward, so that toward Barnard Castle the upper lime- 
stones soon sink under plates and gritstones ; the main limestone 
fills the Tees and the Greta about Rokeby ; Brignall, and Scar gill 
