1853.] MORRIS — LINCOLNSHIRE OOLITES. 333 



Resting upon this bed is the equivalent of the Oxford clay, con- 

 sisting of 10 feet of dark laminated unctuous claj^ with grey-brown 

 sandy and ferruginous clay ; the dark clay contained Av,iino7iites 

 J/eryf?/^ abundantly, as well as Modiola hipartita, Trigonia clavellata, 

 Thracia depressa, Niicida nuda, Phil., and Saurian bones. The brown 

 sandy clay, which passed into ferruginous rock, contained many well- 

 preserved fossils, the most abundant being — 



GrypliBsa bilobata, in every stage of growth. Panopsea peregrina, Phil. sp. 



Belemnites Oweni or Puzosianus. Lima rigidula. 



Ammonites Calloviensis, Sow. Avicula expansa, Phil. 



Nautilus. Pecten demissus and P. lens .' 

 Pholadomya acuticosta, Sotv. 



These fossils would indicate that the ferruginous rock and grey 

 sand were the equivalent of the Kelloway rock, which has not been 

 previously noticed in this district. 



Between this point and Peterborough the Cornbrash is exposed 

 along the sides of the railway, covered in some places by thin layers 

 of small gravel. 



The facts disclosed in the above oolitic sections might at first sight 

 appear of too limited a nature to warrant any general conclusions, 

 were it not that they are intimately connected with and dependent 

 upon the action of causes which have affected a wider area ; more 

 especially also as the peculiar physical features and organic contents 

 exhibited by some of the strata, i. e. the argillaceous series, terminate 

 in the surrounding district (as far at least as the observations of 

 the author have enabled him to ascertain) ; which strata are like- 

 wise presumed to be the equivalent of beds in the upper sandstone 

 and shales of Yorkshire, which have not been hitherto considered to 

 range south of the Humber. 



Before, however, proceeding fm'ther, it will be convenient to give 

 a Table illustrative of what we consider to be the development of 

 the lower oolitic series in Lincolnshire and the adjoining counties 

 (Table II.), with a view of facilitating the comparison of them with 

 the lower oolites of the North and South * ; and also of explaining the 

 beds exposed by railway sections ; for it will only be by an attentive 

 study of the features displayed by these deposits in the midland dis- 

 tricts, that a correct or clearer knowledge will be obtained of their 

 varying physical characters, and the changes that the area has 

 undergone during their deposition. 



* We here refer to the Coast of Yoikshire in the N., and the Counties of 

 Wiltshire and Gloucestershire in the S.W. 



