1873.] SHARP — OOLITES OF NORTHAMPTONSHIRE. 285 



Table showing the Probable Synchronous Relation of the Northampton- 

 shire Beds to Formations in Yorkshire and the South-West of 

 England. 



Yorkshire. 



Northamptonshire, &c. 



S.W. of England. 



Oxford Clay. 



Oxford Clay. 



Oxford Clay. 



CORNBRASH. 



CORNBRASH. 



CORNBRASH. 



Great Oolite : — 



Great Oolite : — 

 Great Oolite Clay. 



Great Oolite Limestone. 

 Upper Estuarine. 



Great Oolite : — 

 Forest Marble. 

 Bradford Clay. 

 Limestones of Great 

 Oolite of Bath, the 

 Cotteswolds, and the 

 Upper Beds at Min- 

 chinhampton. 

 Stonesfield Slate. 





Upper Plant Shale ? 



Inferior Oolite : — 



Grey Limestone of Scar- 

 borough. 



Lower Plant Shale. 



Ferruginous Beds of 

 Glaizedale. 

 The Dogger. 



Inferior Oolite 

 Lincolnshire Limes 



Lower Estuarine. "" 



Ferruginous Beds, 

 Upper Portion. 



Ferruginous Beds, 

 Lower Portion. J 



tone. 



o 

 cog. 



• »o 

 o" 

 



Inferior Oolite : — 

 Zone of Am. Parkinsoni. 



Zone of Am. Humphre- 

 sianus. 



Zone of Am. Murchi- 

 sonm *. 



Zone of Am. opalinus, 

 and the Midford Sand. 



Upper Lias. 



I 



Upper Lias. 



Upper Lias. 



The Great Oolite Clay is not represented in Yorkshire, but 

 doubtless answers to the Forest Marble and Bradford Clay of the 

 south-west. 



The Great Oolite Limestone, also, has no representative in York- 

 shire, but is probably equivalent to the Great Oolite of the south- 

 west and to the upper beds of Min chin h amp ton. 



The Upper Estuarine Series, perhaps, answers to the Upper Plant 

 Shale of Yorkshire, but is more certainly the equivalent of the 

 Stonesfield Slate. 



With the Lincolnshire Limestone, the series of Inferior Oolite 

 formations comes in. As indicated by the presence o£Am. terebratus, 

 Phil., it probably is nearly synchronous with the Grey Limestone of 



* Dr. Wright, F.R.S.E., F.G.S., in his " Correlation of the Jurassic Rocks," 

 1869, in a complimentary allusion to my Stellaster Sharpii, Wright, describes 

 that fossil has having been discovered in the Ammonites- Murchisona zone, 

 near Northampton. It was found in the upper portion of the Ironstone section 

 at Duston. 



