330 



MB. W. HILL ON THE LOWER BEDS OE THE UPPER 



Section shown in tlie first of the three large quarries nearly two 

 miles west of the railway station, Barton-on-Humber. 



jft. 

 f fKard white chalk with lines of flints in courses of 



? Zone of j unequal thickness, divided into massive blocks 

 Terebratulina ■{ by irregular joints, which pass through many + 35 

 gracilis. | feet of material, passing down gradually but 

 , l^ decidedly into 



ij I Zone of /^Hard rough yellowish-white rocky chalk, weather- 

 RJiynch. \ ing into thin flakes with uneven nodular surfaces, 

 Cuvieri and •{ divided into beds of uncertain thickness, by 

 Melbom'n j persistent but thin bands of greyish marl, no 



Hock. \^ flints 10 



( Thin greenish-grey marly veins enclosing whiter 



marly chalk ^ 5- 



Zone of Smooth grey marly chalk, weathering into thin 



Belemnitella ■{ laminae 2 



plena. Dark bluish-grey marly chalk, weathering into thin 



I laminge, centre darkest, the colour variegated 



« I i^ with buff or lighter grey 1 



% ( Very rough nodular chalk, graduating to f 



3 I I Less rough, irregularly jointed whitish chalk 2 



Zone of \ A remarkably massive course of whitish hard chalk 2^ 

 I Holaster \ Bedded whitish chalk, separating by weathering in- 

 1^ suhglohosus. |^ to thin platy pieces along green-grey marly veins 10 



The fossils which I found in these pits are those which occur 

 most commonly at this horizon in the South of England. In the base 

 of the Chalk with flints, I found Rhynchonella Cuvieri, Echinoconus 

 subrotundus, and E. globulus (?). Inoceramus mytiloides was very 

 abundant at the top of the yellowish chalk, and Rhynchonella Cuvieri 

 occurred. Belemnitella j)lena was found in the blue-grey marl, and 

 Rhynchonella plicatilis, Terebratida biplicata, and Ostrea vesicularis 

 in the rubbly band below. Holaster subglobosus and Discoidea cylin- 

 drica were not uncommon in the lowest bed. 



With regard to the thickness of the Lower Chalk of Lincolnshire, 



1 should estimate it generally at about 75 feet, and I am hardly 

 prepared, with the author of the Memoir, to consider it thicker at 

 the southern end of the Wolds than at Louth. 



I have now sketched, as briefly as the matter will allow, the cha- 

 racters and sequence of the lower beds of the Upper Cretaceous 

 series in Lincolnshire ; and, viewed by the light of recent investiga- 

 tions in jS'orfolk, the correlation of the series is by no means diffi- 

 cult. The general likeness of the Eed Chalk and lower part of the 

 Chalk Marl has long been recognized. 



The persistence of the Totternhoe Stone through Norfolk and 

 Suffolk, in spite of the general attenuation, is a fact which, of itself, 

 would lead one to infer the possible existence of a like bed in 

 Lincolnshire, where the similarity of the chalk below is so great. 

 That it is represented by the band of gritty grey-coloured chalk, 

 which in its position, general character, and fauna, bears the closest 

 relation to the Totternhoe Stone, is, I think, a natural inference. 



