338 



THE GEOLOGIST. 



little curious bivalved crustacean, Leperditia {marginataf), are 

 abundant on the surface of the shales. Here is also a fish-bed, crowded 

 with tuberculated scales and spines of minute fishes {Pleetrodus ?). 



These beds are,- in their turn, covered up by the tilestones, of which 

 the upper series is finely esposed along the sides of Carve Dale, at 

 Bouldon, Sutton, and ISorton. The latter place has lately yielded 

 Fteraspides, of great interest, in the equivalent of the Trimpley-bed. 

 Fteraspis Crouchii is a new form from this place, named in honour of the 

 discoverer, the Eev. J". T. Crouch, of Pembridge. "With the lower 

 tilestones I had not time to make acquaintance, if they are exposed 

 near Ludlow ; the micaceous red marl " of the Geological Survey 

 Map, marked as occurring on the South flank of Llanwen Hill (near 

 Knighton), appears to belong to this series, and to be the equivalent of 

 beds covering up Downton Sandstone at Abberley, (N. end of the hill), 

 and, in my own neighbourhood, of the lowest tilestones exposed in the 

 anticlinal ridge of Trimpley.*' In this micaceous marl of Llanwen, 

 I met with Ceratiocaris spines. It there rests against Downton 

 Sandstone, of remarkably hard character, containing the usual fossils. 



Beneath the Ludlow bone-bed," the Upper and Lower Ludlow 

 Kocks are in the whole district, W. and S. W. of the town, crowded 

 with instructive fossils. The quarries afWhitcliff for the upper series, 

 and Yinnal Hill for the lower, will afford the collector a fine series of 

 instructive forms. 



Through these we passed Eurrington, where, in "Wenlock shale, 

 great numbers of Trilobites {Calymene tuberculosa, and Phacops 

 caudatus,) may be met with, enclosed in hard nodules. Unfortunately, 

 they are not easy to split open, without damaging the fossils contained. 



Near the Bridge, Phacops longicaudatus (which may be only the 

 perfect P. caudatus) is plentiful. Tor this, and other courteous 

 directions, I am indebted to Mr. Marston, of Ludlow, who has devoted 

 so much time to the district. Taking the lane for Whitton, a Lower 

 Ludlow quarry on the right hand gave me some fairly-preserved 

 remains of Ceratiocaris, with bifid tail ; these spines, generally found 

 separate from the jointed plates, have been variously regarded as 

 ichthyic fin- spines, and crustacean pincers {Leptoclieles). 



This bed, lying beneath the upper tilestone, there exposed, has been recently 

 broken into on the crown of the hill. No fcs!:ils of importance have yet 

 occurred. 



