76 
LOWER OOLITIC ROCKS OF ENGLAND I 
zones cannot at any one spot be studied in sequence, 
distribution of the local zones may be stated as follows : 
THICKNESS. 
The 
A. ParTcinsoni 
A. humphriesianus 
A. Sauzei - 
A. concavus or A. Sowerbyi 
A. Murchisonce 
FEET. 
- 15 to 45 Bradford Abbas, Sherborne. 
-i , * / Oborne, Milborne Week, 
1 to 6 | Oborne. 
3 or 4 Bradford Abbas. 
1 to 6 Bradford Abbas, Sherborne. 
In a recent paper describing the Inferior Oolite of the Sherborne 
district, Mr. Buckman introduces a term bemera as a chronological sub- 
division of an "age," and considers the beds dealt with to have been 
deposited during 12 hemerae, which he names, in descending order, after 
fuscum, zigzag, Truellei, Garantianum, niortense, Humphriesianum , Sauzei, 
Witchellia, discites, concavum, bradfordense, and Murchisonce.* 
These " hemerae " may be regarded as the horizons at which he has 
obtained examples of the several species (or mutations) of Ammonites, 
enumerated. The subject is of great biological interest, but is only in- 
telligible to a specialist. 
A quarry at East Hill, north of Bradford Abbas, formerly 
known as Prof. Buckman's quarry, has exposed the following 
beds : 
Zone of Ammonites ParTcinsoni - 
Zone of A. humphriesianus 
Zone of 
A. Murchisonce 
Goncavus- 
bed," 
or 
Sowerbyi- 
zone." 
" Murchisonce- 
bed." 
6. Pale earthy oolitic lime- 
stones, with A. Par- 
Jsinsoni, a few Gas- 
teropods, and Phola- 
domya 
5. Marly and rubbly lime- 
stone with Terebratula 
Morierei (rare), Wald- 
heimia carinata, and 
Rhynchonella parvula 
3 to 
4. Ferruginous earthy 
limestone (Eotten bed) 
with Ammonites hum- 
phriesianus (small), 
Astarte excavata, A. 
dbliqua, Terebratula 
PhUlipsi, and T. 
sphceroidalis - 
3. Blue earthy and iron- 
shot oolitic limestone, 
much iron-stained in 
places. Chief Fossil 
Bed : with Ammonites 
concavus abundant, A. 
Iceviusculus, Astarte 
elegans, A. excavata 
var. depressiusculus, 
Trigonia striata, Tere- 
bratula maxillata 
2. Paviour or Paving 
stone-bed, oolitic and 
iron-shot limestone, 
with A. Murchisonoo, 
A, bradfordensis , and 
Corals - 4 to 
FT. Is. 
* Quart. Journ. Geol. Soc., vol. xlix. p. 482. 
