/ 



A. E. I'rueman — The Lias of South Lincolnshire. 67 



England' also the lowest beds of the Lias did not contain any 

 ammonites/ while the numerous sections recorded in the Memoirs of 

 the Geological Survey indicate that this condition is of frequent 

 occurrence.* Indeed, it has been suggested that these lowest beds 

 should be considered as of j)re-planorbts age,^ and called " Pleuroniya 

 and Ostrea Beds ".* Their age and relationships were discussed in 

 the paper referred to. 



2. At Barrow-on-Soar Psiloceras planorhis occurs in beds which 

 are the equivalent of the so-called -pre-planorhis beds of other 

 localities. 



3. The third type, associated with the Sun Bed, seen at Cotgrave 

 Gorse, has indications of a slight break in sequence at the top of the 

 RhaBtic. 



The first type of transition from Rhsetic to Lias may be seen 

 at Owthorpe, Barnstone, and near East Leake, where the sections 

 all conform more or less to the following : — 



Feet. 

 Angulata f Dark - blue shales with Selenite crystals and with rare 

 zone. I, limestone nodules, with Schl. angulata . . . .10 



Dark-blue shales . . . . . . about 9 



" Eoof Bed," a massive bed of yellow earthy limestone 



with Lima and P. planorbis ...... 1 



Flaggy beds ; fissile limestones or shales with abundant 



Flanorbis J C. Johnstoni ........ 2 



zone. \ Earthy limestone and shales with P. planorhis . . 3 



,, ,, without ,, . . . 2 



Fine blue limestone with Oyster Beds and Pleuromya . 2 



Hard blue shales with irregular limestones and Modiola 



^ minima ......... 5 



The beds with Schlotheimia angulata were not exposed except at 

 Barnstone, where they may be seen at the south-eastern end of the 

 quarry. The sections at Coddiugton, in the trenches two miles east 

 of Newark Church, show about 20 feet of hard limestones and shales 

 belonging to the planorlis zone. The upper beds in this district are 

 much coarser than those in the south of the county, but the section 

 does not differ in any essential points from that noted by Wilson^ in 

 the same neighbourhood at Gotham. 



Only one section of Lower Lias can now be examined in the neigh- 

 bourhood of Barrow-on-Soar, and this is situated north of tlie 

 railway near Sileby, one and a half miles west-south-west of Barrow 

 Church. The details are similar to those given by H. B. Woodward * 

 and M. Brown. ^ Comparing these two interpretations, it will be 

 noted first that Brown assigned to the Ehsetic certain beds, about 



•* T. Wright, " Lower Lias and Avicula contorta zone " : Q.J.G.S., vol. xvi, 

 p. 374, 1860. 



^ See, for example, H. B. Woodward, Lias of England and Wales (Mem. 

 Geol. Surv.), 1893, pp. 137, 141, 145. 



^ L. Eichardson, Geology of Cheltenham, 1904, p. 38. 



■* S. S. Buckman, Yorkshire Type Ammonites, vol. i, p. xvi, 1910. 



^ E. Wilson, Geology of South-West Lincolnshire (Mem. Geol. Surv.), 1885, 

 p. 27. 



^ H. B. Woodward, Lias of England and Wales (Mem. Geol. Surv.), 1893, 

 p. 169. 



'' In Geology o Country near Leicester (Mem. Geol. Surv.), 1903, pp. 22-3. 



