SECTION AT HOED WELL CLIFFS. 571 



section, said to average from 15 to 20 feet. A one-inch lignite layer 

 runs across the middle of the bed, and it is said to be almost devoid 

 of fossils ; everything agrees with our description except the thickness. 



(20) Lignite and clay, 8 inches. 



(19) Alternating buff and pale greenish sands, 1 foot. 



(18) Bright green clay and stilt' green clay, 1 foot 9 inches. 



These correspond "with bed (7) of the Marchioness's section, the 

 mean thickness of which is given as -1-6 feet, which exceeds our 

 measurement. 



(17) Pale cream-coloured Limncz a-limestone, 3-7 inches, con- 

 taining several species of Limncea and Planorbis rotundatus. It 

 corresponds obviously to bed (8) of the Marchioness's section. Dr. 

 Wright mentions Char a seeds as occurring in this bed. 



(16) Clay, sometimes lignitic, 1 inch; then stiff greenish clay, 

 4| feet, with a thick iron-stone bed in the middle ; at the base of 

 these clays the sediments become more sandy, and contain Pota- 

 momya plana. This corresponds to bed (9) of the Marchioness's 

 section, who, however, as usual, gives a greater thickness to it. 



(15) At the top is soft sand, with Paludina lenta, Limncea 

 caudata, Potamomya plana, Cyrena arenaria, Dreissena, Lepidosteus, 

 and Crocodile; then hard sand of a pale or whitish tint, with 

 plates of Turtles, and bands of Potamomya plana ; below are whity- 

 brown sands, with carbonaceous layers and Potamomya in bands. 

 The whole, about 7 feet thick, may be called the Crocodile-bed, 

 having been so known to local, collectors ; the best horizon for 

 Crocodiles is about 5 feet up in this bed. 



In the Marchioness's section it is ISTo. 10, given as 8-9 feet, 

 and seeds of Gliara are mentioned. She also says that it is the 

 only bed, except her Xo. 3, in which Potamides is found"*. In the 

 Woodwardian Museum there is a Crocodilus Mastingske collected 

 by one of us, with several specimens of Potamides pyrgota in the 

 matrix among the bones. The Marchioness draws attention to this 

 association. Of mammals, she mentions Paloplotherium , Dichobune, 

 Hycenodon, found in this bed ; of reptiles, besides the Crocodile, are 

 Trionyx Henrici, T. Barbaras, T. marginatum, T. circumsulcatus, and 

 Emys crassus. Dr. Wright t states that Palcwtlierium splenum, P. 

 parvum, P. annectens, Microcfioerus, and Spalacodon were also found 

 in this bed. He does not state his authority. Searles Wood, in 

 figuring Microclioerus, does not state in which bed he found it. 



(14) Greenish clay, 2 inches ; whity-brown sand, 6 inches ; bluish 

 grey clay-band, 1 inch, with Melanopsis brevis. 



(13) Light greyish-white sands, 6-9 inches : a constant bed. It 

 may be called the Eolled-bone bed, from the abraded state of the 

 remains. Mammalian bones, Emys, Trionyx, and Crocodile are 

 mentioned by the Marchioness. These last two beds apparently 

 correspond to No. 11 of her section. 



* In her later paper (Phil. Mag. loc. cit. p. 6) the Marchioness considerably 

 modifies this statement, as follows : — "This and strata 5 and 11 are the only 

 beds where the first-mentioned of these shells [Potamides] is found, except very 

 sparingly, and stratum 10 is the only one where they are found in abundance." 

 —Ed. Q. J. a. S. 



t Loc. cit. p. 126. 



