412 W. D. Lang — Lower Pliensbachian of Charmouth. 



of tlie Upper Marls. The Survey Memoir mentions " nodules and 

 irapersistent masses of hard grey limestone within two feet of [below] 

 the Beleninite Stone ".' At about this horizon, at Westhay Water, 

 and forming a shelf at the top of the waterfall, is a lenticular 

 bed of Limestone, 1 to 2 inches thick, largely composed of Orinoid 

 remains. 



The Beleninite Marls do not vary much in thickness, as a whole, 

 from their appearance on the western shoulder of Black Ven to their 

 disappeaiance beneath the beach east of the big Bidge fault ; they 

 vary a good deal, however, in the thickness and hardness of individual 

 pale beds, which is probably .due to the amount of segregation of 

 calcium carbonate that lias taken place ; the thicker and paler the 

 bed, the harder and more calcareous it appears. The limestones 

 throughout the Charmouth Lias appear to be of the nature of segre- 

 gations ; the most complete having the form of nodules, like those of 

 the Siellaris Beds- and the Lower Limestone of the Green Ammonite 

 Beds^; the less complete being muddy limestones like those of the 

 lucklandi zone (the i^/r(?/»V Bed ^ is an example of a limestone now 

 nodular, now tabular) ; the still less complete being indurated marls 

 like those under discussion. Table Leilge * is a transition from an 

 indurated marl to a muddy limestone. 



East of the Ridge fault the Beleninite Stone rises to the foot of the 

 cliff about a quarter of a mile east of St. Gabriel's Mouth, but soon 

 plunges under the beach again, reappearing once more between 

 Golden Cap and Seatown.* And the Upper Marls are exposed 

 between the tide-marks under Golden Cap.^ 



It has been suggested that the Armatus Limestone and the 

 indurated marls just above it are included in the two bottom beds 

 of the six subdivisions made by the Survey in the Beleninite 

 Marls. The third division from the bottom probably represents 

 the rest of the Lower Marls, and the fourth, division the Lower 

 Pale Band of this paper. The fifth, then, would include the rest 

 of the Middle Marls and all except the top 6 feet of the Upper 

 Marls ; and the top division, the Beleninite Shales and the Pyritic 

 Marls. At any rate this correlation is more satisfactory than that 

 attempted for the Green Ammonite Beds. 



Finally, I would express my thanks, first to my wife for much 

 help in the field ; also to Mr. Thomas Hunter, fisherman, of Charmouth, 

 who has known these cliffs from boyhood and helped E. C. H. Day 

 Avho first worked them in detail, and for some years from time to 

 time has given me much useful information and advice ; and to 

 Mr. L. Spath, F.G.S., for advice in connexion with the ammonites 

 mentioned in the paper; as well as to Mr. S. S. Buckman, F.G.S., 

 and Mr. P. B. Newton, F.G.S., whose help in each case has been 

 indicated in the text of the paper. 



^ H. B. Woodward, op. cit., 1893, p. 68. 



- H. B. Woodward, op. cit., 1893, p. 65, ^^ Am. stellaris in nodules." 



•* See ante, pp. 401-2. 



■* H. B. Woodward, op. cit., 1893, p. 60. 



^ H. B. Woodward, op. cit., 1893, p. 52. 



•^ H. B. Woodward, op. cit., 1893, p. 66. 



