﻿258 
  G. 
  B. 
  Wieland 
  — 
  On 
  Liassic 
  Floras. 
  

  

  8. 
  More 
  or 
  less 
  lenticular 
  grits 
  followed 
  by 
  sandy 
  and 
  

  

  clayey 
  strata 
  — 
  - 
  M. 
  53 
  

  

  [Note. 
  — 
  The 
  numbers 
  1-18 
  were 
  at 
  first 
  assigned 
  to 
  

   the 
  preceding 
  1 
  to 
  8 
  ; 
  but 
  as 
  the 
  outcrops 
  of 
  these 
  

   strata 
  on 
  the 
  barranca 
  yielded 
  few 
  fossils 
  the 
  lesser 
  

   divisions 
  were 
  soon 
  dropped. 
  The 
  next 
  numeral 
  19 
  is 
  

   therefore 
  arbitrarily 
  made 
  to 
  follow 
  No. 
  8.] 
  

   19*. 
  Yellow 
  much 
  checked 
  ferruginous 
  and 
  arenaceous 
  

   shales 
  sometimes 
  slightly 
  conglomeratic. 
  Uppermost 
  

   portion 
  rich 
  in 
  fossil 
  plants. 
  A 
  small 
  quarry 
  established 
  

   on 
  the 
  right 
  bank 
  of 
  the 
  barranca 
  immediately 
  oppo- 
  

   site 
  a 
  large 
  "ahuehete" 
  (Taxodium 
  mucronatum) 
  

   yielded 
  the 
  Otozamites 
  hespera 
  of 
  Plate 
  VIII. 
  Dip 
  50°. 
  M. 
  60 
  

  

  20. 
  Easily 
  eroded 
  argillaceous 
  and 
  sandy 
  material 
  not 
  

   forming 
  surface 
  ledges 
  or 
  outcrops 
  along 
  the 
  barranca. 
  M. 
  25 
  

  

  21. 
  A 
  distinctly 
  gritty 
  to 
  conglomeratic 
  stratum 
  M. 
  1 
  

  

  22. 
  Argillaceous 
  sandstones 
  M. 
  2 
  

  

  23. 
  Small 
  pebble, 
  but 
  well-marked 
  conglomerate 
  M. 
  2*5 
  

  

  24. 
  Light 
  or 
  slightly 
  chocolate-colored 
  sandy 
  shale 
  M. 
  2 
  

  

  25. 
  Sandy, 
  gritty 
  to 
  conglomeratic 
  layer 
  M. 
  4 
  

  

  26. 
  Clayey, 
  ferruginous 
  shale 
  much 
  like 
  No. 
  24, 
  markedly 
  

   concretionary 
  below 
  _. 
  M. 
  2'5 
  

  

  27.* 
  Gritty 
  sandstone 
  with 
  indistinct 
  remains 
  of 
  plants 
  M. 
  1 
  

  

  28. 
  Repetition 
  of 
  Nos. 
  24 
  and 
  26 
  M. 
  1 
  

  

  29.* 
  A 
  repetition 
  of 
  No. 
  27 
  with 
  grits 
  below 
  succeeded 
  by 
  

   finer 
  materials 
  above 
  containing 
  Ptilophyllum 
  or 
  

   Williamsonia 
  pecten 
  fronds 
  _ 
  M. 
  2 
  

  

  30.* 
  A 
  soft 
  sandstone 
  corresponding 
  to 
  Nos. 
  24, 
  28, 
  with 
  

  

  some 
  fossils 
  .. 
  M. 
  2 
  

  

  31. 
  Stratum 
  gritty 
  below 
  to 
  smooth 
  above. 
  Sandy. 
  A 
  

  

  repetition 
  of 
  Nos. 
  27 
  and 
  29 
  M. 
  1 
  

  

  32.* 
  Sandy 
  material 
  with 
  numerous 
  Ptilophyllums 
  in 
  mid- 
  

   dle 
  portion. 
  [No 
  quarry 
  was 
  opened 
  here, 
  although 
  

   one 
  should 
  be 
  made] 
  M. 
  3 
  

  

  33.* 
  Gritty 
  clays 
  and 
  sands 
  with 
  some 
  plants 
  above 
  M. 
  2 
  

  

  34. 
  Shales 
  repeating 
  the 
  characters 
  of 
  Nos. 
  24, 
  26, 
  28, 
  and 
  

  

  30 
  M. 
  3-5 
  

  

  35. 
  Gritty 
  below 
  and 
  shading 
  into 
  finer 
  sandstone 
  above, 
  

   precisely 
  as 
  in 
  No. 
  33 
  ; 
  but 
  no 
  plants 
  noted 
  M. 
  2 
  

  

  36. 
  Shale 
  without 
  hard 
  ledges 
  continuing 
  up 
  to 
  another 
  

   layer 
  of 
  grit 
  _ 
  _ 
  _ 
  M. 
  16 
  

  

  37. 
  Sandstone 
  with 
  more 
  or 
  less 
  flow 
  and 
  plunge 
  structure, 
  

   although 
  clays 
  are 
  also 
  interpolated. 
  Apparently 
  com- 
  

   bines 
  the 
  same 
  kind 
  of 
  materials 
  that 
  are 
  more 
  dis- 
  

   tinctly 
  separated 
  into 
  the 
  lesser 
  strata 
  numbered 
  26, 
  

  

  28, 
  30 
  and 
  27, 
  29, 
  31 
  M. 
  16 
  

  

  38. 
  Sanely 
  to 
  clayey 
  horizon, 
  straticulate 
  to 
  nodular, 
  and 
  

  

  not 
  varying 
  sharply 
  from 
  No. 
  37. 
  _ 
  M. 
  3 
  

  

  39. 
  Gritty 
  to 
  conglomeratic 
  stratum, 
  harder 
  and 
  more 
  

   quartzose 
  than 
  the 
  preceding 
  . 
  _ 
  M. 
  1 
  

  

  