Reviews—The Geology around Lincoin. 571 
IlI.—Grotoctcan Survey Memorrs.—(2.) Tue Gronocy or THE 
Country arounp Lincotn. By W. A. EH. Ussuer, F.G.S., A. J. 
JuKeES-Browne, B.A., F.G.S., and Ausprey Srragan, M.A., 
F.G.S. (In Part from Notes by W. H Pennine, F.G.S., W. H. 
Datton, F.G.8., and A. C.G. Camzron.) 8vo. pp. 218. Price 3s. 
(London, 1888.) 
LARGE area is described in this Memoir, including the country 
around Tuxford, Gainsborough, Lincoln, Market Rasen, 
Wragby, and Horncastle. 
The rocks exposed range from the Bunter pebble-beds to the 
Chalk, together with Glacial and Post-glacial deposits. 
The various divisions are described in detail, and their chief 
paleontological features are pointed out. The junction of the Lower 
and Middle Lias, nowhere well marked, is now usually taken by the 
Survey at the base of the zone of Ammonites margaritatus, and above 
that of A. capricornus. It appears, however, that in Lincolnshire 
and Yorkshire the two species of Ammonites occur sometimes together. 
While the fossils of the Lias are many of them noted with the 
accounts of the strata, those from the Inferior Oolite (Basement Beds 
and Lincolnshire Limestone) and the Great Oolite Series are, with 
few exceptions, enumerated only in the Appendix, so that we have 
to turn away from the barren account of the rocks to learn, if possi- 
ble, the prominent fossils which they yield. From the Inferior 
Oolite two species of Ammonites are recorded, A. Sowerbyi and A. 
leviusculus. The Cornbrash, Kellaways Rock, and Oxford Clay 
appear here, as elsewhere, to be intimately connected. 
Ammonites Bakerie@ and A. macrocephalus are recorded from the 
Cornbrash. This formation is separated from the Kellaways Rock 
by a few feet of black shales, grouped with the latter, although 
regarded as homotaxial with the “ Avicula Shales” or Cornbrash 
Clay of Yorkshire. The following species are recorded from the 
Upper Oxford Clay near Bardney, forming an interesting assemblage: 
Ammonites perarmatus, A. biplex, A. macrocephalus, A. cordatus, A. 
plicatilis, ete. 
The Lower Cretaceous or Neocomian rocks include the Spilsby 
Sandstone and the Tealby Beds. The Spilsby Sandstone contains 
many derived fossils, while among those regarded as indigenous, are 
Ammonites Kenigi, A. mutabilis, etc. The overlying Tealby Beds are 
divided as follows :— 
Tealby Limestone. 
Tealby Clay. 
Claxby Ironstone. 
These two groups belong to the Speeton Series, and they rest 
unconformably on the Kimeridge Clay, and are overlain unconform- 
ably by the Carstone. 
The Carstone is found to be made up very largely of the rolled 
and washed débris of the Neocomian clays, or where the Carstone is 
missing, the Red Chalk is found to contain fossiliferous nodules 
derived from the same source. Hvidence is brought forward to 
