LOWER LIAR ! LYME REGIS. 59 
purposes on this particular part of the coast, specimens are rarely 
obtained: they may however be found in the quarries at 
Uplyme. There is no evidence whereby the zone of Ammonites 
planorbis can be definitely marked off from the zones succeeding.* 
Gryphcea arcuata (incurva) and Lima gigantea^ which are charac- 
teristic of the " Bucklandi-beds," occur about 7 feet above the 
White Lias, but the forms found so low down are usually much 
smaller than those met with above. The lower division (A) must 
bowever include all the beds representing the zone of Ammonites 
planorbis. 
Continuing eastwards we traverse ledges formed by the suc- 
cessive bands of limestone. Gryphcea arcuata and Lima gigantea 
become more abundant. Some layers are crowded with Rhyn- 
t'.honella calcicosta (R. variabilis of Wright), and in others we find 
shoals of Pentacrinites. Here and there Ammonites angulatus 
may be observed. Further on we come to the cliffs where the 
stone is extensively worked for the Lime and Cement Works, and 
much of it (about 120 tons a week) is shipped away in the raw 
state. The stone is collected from the tumbled masses on the 
beach, and when these have been removed the stone in the cliffs 
is blasted. Each layer has its distinctive name, known to the 
Avorkmen, and these names are recorded in the accompanying 
detailed section. The beds here are practically the same as those 
seen in the Church Cliffs, and the same names are applied to 
them. In the Church Cliffs the beds are somewhat disturbed by 
small faults. 
The beds belong mainly to the zone of Ammonites Bucklandi, 
but include the upper portion of the zone of A. angulatus, the 
lower portion of which has been previously traversed. The suc- 
cession of the zones is as well-marked as could be expected, albeit 
there is no reason to point to any particular layer to indicate a 
separating plane. A. a.ngulatus and A, Bucklandi occur together 
at this locality .f 
In these beds we may obtain fine specimens of Lima gigantea 
and A mmonites Charmassei ; ihe latter, as remarked by Dr. Wright, 
is ribbed in youth, but quite smooth in old age. It occurs as 
high up as the "Best Bed." Large specimens of A. Bucklandi 
are common, and Nautilus striatus and Pentacrinus basaltiformis 
may usually be found. Spiriferina pingnis has also been recorded, 
and I have obtained Ammonite's bisulcatus and Rhynckonella 
calcicosta at Char ton Bay. 
Ammonites scmicostatus occurs near the top of the stone-beds 
at Lyme Regis, as well as in the Hard Marl or Table Ledge 
above ; beds which have been grouped by Dr. Wright in the zone 
of Ammonites Turner?'. The type of this latter species was 
obtained from the Drift of Norfolk, and named after Dawson 
Turner, of Yarmouth. Some doubt has been expressed whether 
* Dr. Wright, Quart. Jourii. Geol. Soc., vol. xvi. pp. 396, 39 7, considered that the 
Am. planorbis beds were represented by the White Lias, a mistake that arose from 
certain beds in the Lower Lias being locally termed " White Lias " by tho quarry- 
men. 
f See also It. F. Tomes, Quart. Journ. Geol. Soc., vol. xxxiv. p. 179. 
