180 MENDIP NOTES. 



Figs. 3 and 4 give a map and section at Biirrington 

 Combe. From the observations there recorded the estimated 

 thicknesses are as follows : — 



Feet. 



Upper or Lithostrotion Limestone (including 



" Mitcheldeania " Beds of Clifton Section) . 700 



Gully Oolite 250 



Lower or Encrinital Limestone . . . 1,300 

 Lower Transition Beds 350 



2,600 



About 60 feet below the top of the Oolite is a parting of 

 orown argillaceous Limestone with reddish shales. Near the 

 top Productus rcticulatus occurs. 



Above the Oolite Lithostrotion is abundant. 



Below the Oolite the Limestones are characteristically 

 encrinital. 



The Lower Transition Beds begin near Cloatchurch Cavern, 

 in the more westerly of the Twin Brooks. 



The Bryozoa Bed is found in the more easterly of the 

 Twiu Brooks just above the path connected with the rifle 

 butts. 



The Lower Transition Beds are slightly, the Lower Lime- 

 stones considerably, thicker than in the Avon Section. 



Notwithstanding that the upper beds of the Upper Lime- 

 stone are hidden by the Basement Beds of the Trias, the 

 total thickness of Lower Carboniferous beds here exposed is 

 thicker than the total thickness of these beds at Clifton. If 

 my estimate of the thickness of the Lower Limestone is 

 correct, it is more than double that in the Avon Section. 



LUCKINGTON. 



I may here note that in a quarry in Ihe Luckington Lime- 



