58 LOWER OOLITIC ROCKS OF ENGLAND: 
FT. INS. 
9. Pale -grey, oolitic, and earthy lime- 
stones, weathering rubbly - - 5 
8. Pale grey and brown earthy lime- 
stone, slightly oolitic and iron-shot 
Upper division J in places. TEREBRATTTLA BED, with 
Inferior Oolite. 1 T. spharoidalis, &c. - - 1 to 2 
7. Grey oolitic and iron-shot limestones, 
compact in places and ferruginous ; 
including ASTABTE BED with A. 
dbliqua, &c. - - -24 
| 6. Pale grey, shelly, oolitic limestone, 
much iron-stained in places - -16 
Lower division J 5. Bubbly band of sandy ochreous 
Inferior Oolite. \ oolite - - 3 
4. Pale grey, brown, and yellow rubbly 
iron -stained oolite - - - 1 6 
3. Yellow micaceous sands - - 2 
Midford Sand I 2. Band of calcareous sandstone. 
(Yeovil and Bridport ^ 1. Yellow sands with bands and nodular 
Sands). | masses of calcareous sandstone, in 
[_ Burton Cliff - - about 80 
The Midford Sand belongs in its upper part to the zone of 
Ammonites opalinus. The Lower division of the Inferior Oolite 
constitutes the zone of Ammonites Murchisonce, with which is 
included the zone of A. Sowerbyi or the t( Concavus Beds," with 
A. concavus; while the Upper division includes the zone of 
A. humphriesianus (not always distinctly represented) and the 
zone of A. Parkinsoni. This grouping was suggested by Mr. 
Hudleston, who has given a section of the Cliffs ; the beds are 
somewhat differently subdivided and grouped by Mr. S. S. 
Buckman.* 
The most noticeable beds are the Astarte-bed and the Tere- 
bratula-bed. The former is well seen in the tumbled blocks on 
the coast. It contains small examples of A. humphriesianus, 
together with A. Parkinsoni ; and these forms occur together just 
below the Terebratula-bed, in a quarry south of the road between 
Bridport Harbour and Burton Bradstock, and nearly due north 
of the mouth of the Bride. I have found A. humphriesianus also 
in the Terebratula-bed. This indistinct development of the 
zone of A. humphriesianus has been noticed by Oppelf and 
Mr. HudlestonJ ; but so far as Dorsetshire is concerned, this 
imperfection is local, for fine specimens of this Ammonite occur 
at Hyde quarry south-east of Bridport, and again at Oborne. 
The Terebratula-bed is well shown in the quarries between Brid- 
port Harbour and Burton Bradstock, and these expose also the 
iron-shot oolite below. The stone in these quarries was obtained 
chiefly for building stone-fences, and it is now occasionally dug 
for road-metal. The minor details of the beds seen in the quarries, 
* Hudleston, Gasteropoda of Inf. Oolite (Pal. Soc.), p. 31 5 see also R. Etheridge 
in Damon's Geology of Weymouth, ed. 2, 1884, p. 225 ; S. S. Buckman, Inf. Ool. 
Ammonites, p. 47 ; Quart. Journ. Geol. Soc., vol. xlv. p. 451 ; and Day, Quart. 
Journ. Geol. Soc., vol. xix. p. 287. 
t Oppel, Die Juraformation, p. 339. 
j Hudleston, op. cit. p. 32. 
