Vol. 67.] 



WEST, MID, AND EAST SOMEESET. 



15 



the ' Cotham Beds' — the lowest bed of the 'White Lias ' there rests 

 non-sequentially upon the lower portion of the bottom deposits of 

 the Cotham Beds, which have been partly eroded and fissured, 

 and the cracks filled up with gritty material, before the lowest bed 

 of the ' White Lias' there present was laid down. Here at Blue 

 Anchor, however, the Cotham Beds are complete. The ' W T hite 

 Lias ' or Langport Beds of Blue- Anchor and Lavernock Points cor- 

 respond remarkably well, as the numbers in square brackets (below), 

 which refer to Lavernock, are intended to indicate. 



The shales, which I lettered A at Lavernock and grouped pro- 

 visionally with the ' White Lias,' are represented by an increased 

 thickness of similar deposit at Blue Anchor Point, and I have 

 suggested that they shall bear the name of ' Watchet Beds.' They 

 are succeeded at Blue Anchor, as at Lavernock Point, by those very 

 distinctive hard brown shales for which the name of ' Paper-Shales' 

 is so appropriate — occasionally hardened at the base to simulate a 

 limestone-band. Then comes that massive limestone which doubt- 

 less corresponds to the ' Bottom-Lias ' bed at Dunball (p. 33). 



Section at Blue Anchor Point, near Watchet. 



rl. 



Thickness in feet inches. 

 Limestone, hard, blue, ") 



"Bottom Lias. 

 but shattered 



Shales, hard, pale-grey and brown, becom 

 ing compact and passing down into 

 fissile 



Limestone, which is not always con- 

 spicuous 



Shales, well-laminated, brownish-yellow. 

 with a few thin layers of gritty lime- 

 stone, one especially noticeable at 11 



. inches above Bed 2 ; about 



Marl, yellowish, sandy in appearance ... 



Shales, hard, brown, laminated, with thin 7 -1 

 layers of fibrous calcite ) 



Shales, bluish-grey, not very well lami- ~) , 

 nated 



Limestone, bluish-grey, weathering pale- 

 brown, but often not very conspicuous 

 2 to 4 inches 



Marl, bluish-grey, laminated: 3 to 4") Q 

 inches > 



Limestone, hard, pale-brown and bluish- \ ft 

 grejr centred ) 



Marl, brown 



a^O 



I' 



( 



:} 



:} 



3- 



Ostrea liassica Strickland. 



= Paper-Shales. 



Ostrea liassica common at 

 the top. 



Ostrea liassica. 



Fragment of Ostrea, Di- 

 myodon intus-striatus 

 (Emmerich), Chlamys 

 (sp. indet.). 



<« 



fLimestone, hard, greyish-brown, 

 shelly, conchoidal fracture. At 

 the base, which is very uneven, |>0 

 are lumps of a more compact and 



paler limestone J 



1-3J Marl, brownish-grey 



C Limestone, often absent, 

 5 [4] •< brown and greenish-grey, 



(. earthy : to 1 inch 



[C] ■{ 6f- 5 "1 C Marl, pale-brown with a 

 to8|_to7J \ thin limestone at the base. 

 9 [8] Limestone, brown, earthy... 



10 [9] Marl, brownish 



^ 11 riO'l $ limestone, hard, bluish- "> Q 

 J (. grey, conchoidal fracture . ) 



3- 



Ostrea liassica (common), 

 Dimyodon intus-striatus. 



C Dimyodon intus-striatus, 

 < Protocardia rluetica (Me- 

 (. rian). 



Shell-debris, 

 3 



