192 
LOWER OOLITIC ROCKS OF ENGLAND 
Lincolnshire 
Limestone. 
Northampton 
Beds. 
Upper Lias 
Hard shelly limestone, blue-hearted ; 
known as the Rag or Weldoii Marble 
(used for walling, road-stone, land- 
ings, steps, &c., and occasionally 
<< polished) - - 2 to 
Oolitic freestone, current-bedded in 
places (known as the A. bed) 
Oolite : bottom-freestone (ktiown as 
the A. 1 bed) - - 3 9 to 
Fine oolite (easily worked, but local, 
known as the B. bed) 
Eough shelly limestone, with moulds 
and casts of shells 
Fine pink-coloured oolitic freestone 
Fossil-bed (known also as the Marble 
Bed takes a good polish) 
Ironstone - 
Sandy clay 
Greenish sand, passing down into 
\ bluish-grey sand 
) " Fossil-bed " passing down into bed 
(_ below - - - - 2 to 
Blue clay (known as " Gault "). 
FT. IN. 
8 
3 
The freestones vary in places, becoming sometimes more shelly. 
Annelide-borings occur in some of the layers ; and they are faulted and 
joggled in places, with open gullies generally running east and west. 
The thickness from the bottom-freestone to the " Gault " (Upper Lias 
Clay) was 24 ft. 9 in. The information respecting the lower beds is based 
on statements made by the foreman, partly from the evidence of a well- 
sinking, water being obtained from the greenish sandy beds.* 
North-east o Great Weldon, a small opening by the road- side, 
showed false-bedded oolitic and shelly beds with many Gastero- 
pods. These are decomposed limestone-beds, and many specimens 
were obtained by R. Gibbs, formerly the fossil-collector on the 
Geological Surey. The following species have been recorded! : 
Actaeonina glabra. 
Ataphrus (Monodonta) laeviga- 
tus. 
Bourguetia elegans. 
(Phasianella) latiuscula. 
Brachytrema subvaricosum. 
Ceritella lindonensis. 
Cerithium attritum. 
Beani var. weldonis. 
latisulcatum. 
polystrophum. 
Exelissa strangulata var. ovalis. 
weldonis. 
Fibula angustivoluta. 
Natica cincta. 
Nerinsea altivoluta. 
brevivoluta. 
Eudesi, var. 
gracilis. 
Nerinsea pseudocylindrica. 
(cf.) Stricklandi. 
weldonis. 
zonophora. 
Rissoina obliquata. 
Trochus. 
Cardium. 
Corbicella bathonica. 
Myoconcha crassa. 
striatula. 
Mytilus lunularis. 
Ostrea flabelloides. 
Pecten articulatus. 
Trigonia pullus. 
Ehynchonella Crossi. 
Terebratula maxillata. 
Acrosalenia. 
Pseudodiadema depressum. 
Thecosmilia. 
* A section is given by Sharp, Quart. Journ. Geol. Soc., vol. xxix. p. 235 ; see 
also Judd, Geol. of Rutland, &c., p. 151. 
j- Judd, Geol. Rutland, p. 151; Hudleston, Inf. Ool. Gasteropoda, pp. 72, 21S; 
Hudleston and Wilson, Catalogue of Jurassic Gasteropoda, 1892. 
