72 DR a1. J. JEU ON 
traversed by patches and imperfect layers of a blackish hard pan-like material, which 
is probably organic in nature. Above this comes 3 to 4 feet of rubbly material, full of 
fragments of slaty and other rocks of local origin. 
Fine yellow sand is seen also near Llangolman, a little east of Maenclochog, on the 
slopes of the ground rising from the moor, and at Charing Cross there is a pit showing 
roughly-bedded gravel and sand to a depth of 8 feet. A smaller pit of a similar nature 
lies at Cefn Ithyn, just north of Maenclochog. 
Further south, in the neighbourhood of Trefgarn, sand of quite a different character 
occurs. There is an exposure of 12 to 15 feet in a big gravel-pit on the roadside 
opposite the Chapel-of-ease, near Nant-y-coe mill. The fine gravel and sand here is 
dark grey in colour, and consists largely of minute flattened flakes. The sand is not 
— Ppa > Z el ZZ LO Zt Wl ——- Soi) 
Ta rT WRTRT= VERON ARES DUD, < TOA 1 ATEN NY ANY NSO TURES Ta Sh S15 
s/% as Vv SON SAT TIST Not Niner WO seg Ne Seca Bh Ba) kL) ee ia a ee WLS I tS eS 4 
TOR ea CE SO ee NI ee MOT TG NG eines SAIN Na IN STIR SON NG SSNS -- Rubble, full of 
At er Z \ TIE ION 4’ Ne om / 1 NANYN EN a LN r=) MIO . Pra Geter lean— i 
Qe SY Res A TR OLY ETN Ree TN ee TN ee NSS ar my Fa ON cl pe fragments of 
3-4 feet - — SS Z PNW SET, OS a OWN OS) FD N Pom slate, ete. 
es i —_ ES LO, area ‘ Ni van: . 
— —\——~ U 
.—"\ 
VAIN 
SIRNAS NO 
177) 
leon 
4-6 feet .-- --~ Fine yellow 
sand, ferru- 
ginous in 
places, with 
patches and 
bandsof black- 
ish pan-like 
material. 
Z \ 
——- Talus slope. 
Fie, 2.—Diagrammatic Section of the Rose-bush Sand-pit. 
yellow nor brown like that found further north, which the natives speak of as 
‘“‘Demerara-sugar” sand. In Trefgarn Hall park there is a pit where the material 
seen is somewhat similar, but much coarser. The stones are rounded and sub-angular. 
The deposits here do not remind one so much of the sand and gravel found on sea- 
shores. 
List of Mollusca found in the Manorowen Sand and Gravel Pit.* 
LAMELLIBRANCHIA. 
Nuculana pernula, Mull. 5 : ‘ - ‘ : ; : : rare. 
Pectunculus glycimeris, L.  . : 4 : : ‘ ‘ ; : very common. 
Barbatia lactea, L. : : : : : : é 3 : : very rare. 
Mytilus edulis, L. : ; : : : : : : : ; rare. 
Vulsella modiola’ L. . ; : : ; : : : ; very rare. 
Astarte sulcata, Da Costa. ; : : ; : : 1 5 very common. 
Astarte (Nicania) compressa, Mont. 5 5 5 : : : : moderately rare. 
Astarte (Tridonta) arctica, Gray (= borealis) moderately rare. 
* The specimens which I collected from this place, together with some obtained subsequently by Mr V. M. 
TURNBULL, are now in the Sedgwick Museum, Cambridge. 
