BUFFALO SOCIETY OF NATURAL SCIENCES 1 55 



with the exception of the Lingulae. Life on the whole became scarce, 

 only the fish, crustacean, and eurypterid remains occurring in any 

 abundance, and these, as is customary, only at certain horizons. 

 The mottled sandstones and shales immediately overlying the Bone- 

 Bed and forming the base of the Downton Castle sandstones is practi- 

 cally barren. Then follows a thin band with Beyrichia which gives 

 place to the Platyschisma bed proper (E b) which is composed almost 

 entirely of Platyschisma helicites and Modiolopsis complanata. This 

 band is delimited upwards by a second Beyrichia zone. Finally, the 

 massive, yellow, micaceous sandstones of the typical Downton ap- 

 pear (E c). These show leaf -like shale partings with Beyrichia, and 

 other beds with fragments of eurypterids together with the plant 

 (a spore?) Pachytheca, and with Lingula minima. 



The Temeside or Eurypterid shales (F) are not seen in the Ludford 

 Lane section in which even the Downton group is incomplete. It is 

 not possible to find a continuous section at any one place; but the con- 

 tacts between each pair of the groups have been seen, so that by com- 

 bining the sections exposed within a distance of about four miles 

 the entire sequence may be obtained. The contact between the Down- 

 ton Castle sandstones and the Temeside shales may be seen at Forge 

 Bridge, a little over half a mile northeast of Downton Castle; and the 

 junction between the Temeside group and the Old Red sandstone is 

 visible at Tin-Mill Race about half a mile beyond Forge Bridge. The 

 contact of the lowest division of this group (Fa) with the underlying 

 Downton Castle sandstones is not here observable. The first beds are 

 rubbly shales which, a short distance up, contain a band of red shale. 

 At a higher level occurs a local bed containing broken Lingula cornea, 

 Onchus teniustriatus , C ten acanthus-like spines and Leperditia cf. 

 marginata (61, 211). There follows a thin sandstone bed, and then 

 a grey shale with Lingula cornea, above which comes the typical olive- 

 shale of F d with the Temeside Bone-Bed which is very similar to 

 the Ludlow Bone-Bed. From this horizon Elles and Slater record 

 the following interesting fauna (61, 211): 



Pterygotus ludensis 

 P. problematicus 

 Onchus teniuistriatus 

 O. murchisoni 

 O. sp. 

 Lingula cornea 



