RICHARDSON : THE LOWER OOLITIC ROCKS OF YORKSHIRE. 189 
o 
i ^ ^ 
» s 
Serpula\Vll. 
Beds, j 
Lingula- 
Beds. 
( (a) Sandstone grey with a much 
nailed surface ; Rhynchonella cyno- 
cephala auctt., Terebratula sp., 
Aulacothyris hlakei (Walker), Lin- 
gula heani Phil., Dentalium elonga- 
tum, Pteria intvquivalvis auctt., 
Pecten sp., fucoids 2 spp.. Lignite. . 
(6) Brown ferruginous band with a layer 
of belemnites at its base. Often not 
much more than a parting 
(c) Sandstone, grey, false-bedded, very 
micaceous with a band rich in 
^ Serpulce at the base 
VIII. Sandstone, grey, shaly. At 4 feet 
from the top is a line of nodule-like 
burrs containing Phlyseogrammo- 
ceras dispansum (Lye), Hudles- 
tonia affinis (Seebach), H. aff. 
affinis (Seebach), Lingula heani 
Phil., Pinna cuneata, Phil., Ceri- 
thium quadrilineatum, etc.. . 
IX. Shale soft grey with Lingula at the 
base . . 
From the " Grey Beds " have been obtained 
Pseudolioceras sp. nov., Hudlestonia uykiensis S. 
Buckman, H. cf. wykiensis S. Buckm., H. cf. sinuosa 
S. Buckm. non Bayle, Glyphaa birdi Bean MS., 
Orbiculoidea reflexa (Sow.), etc. 
Thickness in 
Feet. Ins. 
run- 
4 0 
1 0 
5 6 
25 
Striatulti8-^YiB\es 
(top part msiy be of 
dispansi ; 
and struckmanni 
hemerx :* main 
portion of striatuli). 
Alum Shales. 
Shaly rock full of spangles of white mica : 
50 to 70 feet 
60 0 
Shales with a band of Umestone-nodules 
full of specimens of Pseudomonotis 
suhstriatus at the top. 
♦ There is no evidence for any deposit of pedici hemera. 
Previous to the present time the only portion of the Yellow 
and Grey Beds that has been definitely dated has been the 
Lingula-Bed portion of the Grey Beds. This Mr. Buckman has 
dated as dumortierice-dis'pansi. Now, however, it is known 
that the Yellow Beds are of dumortierice hemera and the Grey 
Beds of dispansi ; while the Nerincea-Bed is mainly murchisonce. 
Even if there is some deposit of scissi hemera closeh^ associated 
with that of murchisonce date in the Nerincm-Bed, there is a 
considerable non-sequence between the Nerincea-Bed and sub- 
jacent sandstone, for no e\"idence of am^ deposits of opalini- 
formis, aalensis or moorei hemerae has yet been obtained. 
The division-line between the Lias and Oolites is now generally 
drawn between the aalensis- and moorei -Beds, and as both are 
