﻿1864.] 
  MAW 
  SEVERN- 
  VALLEY 
  DRIFT. 
  135 
  

  

  I 
  am 
  indebted 
  to 
  Dr. 
  Duncan, 
  Sec. 
  G.S., 
  and 
  to 
  Mr. 
  Jenkins, 
  

   Assistant- 
  Secretary 
  G.S., 
  for 
  the 
  accompanying 
  list 
  of 
  derivative 
  

   fossils 
  from 
  the 
  Strethill 
  drift-beds, 
  which 
  they 
  have 
  kindly 
  deter- 
  

   mined 
  for 
  me. 
  

  

  List 
  of 
  Fossil 
  Corals 
  found 
  in 
  the 
  Drift 
  of 
  the 
  Severn 
  Valley. 
  

  

  1. 
  Cretaceous 
  (upper). 
  Specimens 
  

  

  Parasmilia 
  centralis, 
  Edwards 
  8f 
  Haime 
  1 
  

  

  serpentina, 
  Edwards 
  Sc 
  Haime 
  4 
  

  

  2. 
  Mountain 
  Limestone. 
  

  

  Zaphrentis 
  Phillipsi, 
  Edwards 
  Sc 
  Haime 
  » 
  9 
  

  

  Cyathophyllum 
  Wrigh.tii,'Edwards 
  Sc 
  Haime 
  3 
  

  

  3. 
  Silurian. 
  

  

  Palseocyclus 
  rugosus, 
  Edwards 
  Sc 
  Haime. 
  Dudley 
  & 
  Wenlock 
  4 
  

  

  Fletcheri, 
  Edwards 
  Sc 
  Haime. 
  Dudley 
  1 
  

  

  Plasmopora 
  petalliformis, 
  Lonsdale, 
  sp. 
  Dudley 
  1 
  

  

  Ptychophylluni 
  patellatum, 
  Schl. 
  Wenlock 
  1 
  

  

  Cyathophyllum 
  pseudo-ceratites, 
  M 
  ■ 
  Coy, 
  sp. 
  Wenlock 
  3 
  

  

  truncatum, 
  Edwards 
  Sc 
  Haime. 
  Wenlock, 
  Aymestry 
  3 
  

  

  flexuosum, 
  Edwards 
  Sc 
  Haime. 
  Wenlock 
  4 
  

  

  angustum, 
  Lonsdale. 
  Wenlock 
  3 
  

  

  Monticulipora 
  pulchella, 
  Edwards 
  Sc 
  Haime. 
  Wenlock 
  1 
  

  

  lens, 
  M' 
  Coy. 
  Lower 
  Silurian 
  1 
  

  

  Halysites 
  catenularia, 
  Edwards 
  Sc 
  Haime. 
  

  

  The 
  indeterminable 
  specimens 
  are 
  mostly 
  Silurian, 
  but 
  there 
  are 
  

   both 
  Carboniferous 
  and 
  Cretaceous 
  forms 
  amongst 
  them. 
  

  

  List 
  of 
  Fossil 
  Shells, 
  tyc, 
  found 
  in 
  the 
  Drift 
  of 
  the 
  Severn 
  Valley. 
  

  

  1. 
  Lias. 
  

  

  Cardinia 
  ovalis, 
  Stutchb. 
  Lower 
  Lias 
  1 
  

  

  Gryphaea 
  incur 
  va, 
  Sow 
  1 
  

  

  Stems 
  of 
  Encrinites. 
  Several 
  specimens. 
  

  

  2. 
  Carboniferous. 
  

  

  Productus 
  scabriculus, 
  Martin. 
  Carboniferous 
  Limestone 
  1 
  

  

  hemispha?ricus, 
  Sow. 
  Small 
  fragments. 
  Carb. 
  Limestone. 
  

  

  Globulus 
  vetustus, 
  Sow. 
  Coal-measures. 
  Coalbrook 
  Dale 
  1 
  

  

  Calamites. 
  C 
  oal-measures 
  : 
  1 
  

  

  Sigillaria. 
  Coal-measures 
  1 
  

  

  Stems 
  of 
  Encrinites. 
  Carboniferous 
  Limestone. 
  Several 
  specimens. 
  

  

  3. 
  Silurian. 
  

  

  Pentamerus 
  linguifer, 
  Sow. 
  Wenlock 
  3 
  

  

  Atrypa 
  reticularis, 
  Linn. 
  Wenlock. 
  Many 
  specimens 
  of 
  all 
  sizes. 
  

  

  Khynchonella 
  deflexa, 
  Sow. 
  Wenlock 
  2 
  

  

  Spirifer 
  crispus, 
  Linn. 
  Wenlock 
  1 
  

  

  Strophomena 
  pecten, 
  Fisch. 
  Lower 
  and 
  Upper 
  Silurian 
  1 
  

  

  Orthis 
  calligramma, 
  Balm., 
  var. 
  Lower 
  Silurian 
  1 
  

  

  Lituites 
  ibex 
  ? 
  , 
  Sow. 
  Ludlow 
  1 
  

  

  On 
  the 
  west 
  side 
  of 
  the 
  Severn 
  Valley, 
  above 
  Buildwas, 
  the 
  drift 
  

   rests 
  on 
  the 
  flanks 
  of 
  the 
  Wenlock-limestone 
  hills 
  to 
  an 
  altitude 
  of 
  

   200 
  feet 
  above 
  the 
  river, 
  and 
  upwards 
  of 
  300 
  feet 
  above 
  the 
  present 
  

   sea 
  -level, 
  but 
  in 
  lesser 
  masses 
  than 
  at 
  Strethill 
  ; 
  for 
  the 
  most 
  part 
  it 
  

   consists 
  of 
  well-washed 
  gravels 
  and 
  sands, 
  varying 
  much 
  in 
  size 
  and 
  

   character, 
  and 
  between 
  which 
  and 
  the 
  tough 
  clay-bed 
  of 
  Strethill 
  I 
  

   have 
  been 
  unable 
  to 
  trace 
  any 
  close 
  stratigraphical 
  correspondence 
  ; 
  

  

  