152 



MR. S. 8. BUCKMA.N ON THE BAJOCIAN [Feb. I9OI, 



Table III. — Dates op the various ' Sands.' 



Northampton Sands & so-called ' Midford 1 . . i_^_„ 



Sands ' of the North Cotteswolds J— ^"^^^^ oemera. 



Ootteswold Sands variabilis & Lilli hemerae. 



Sands around Cole, Burton (Somerset) dispansi heraera. 



Sands near Yeovil JJumoriierice & MooreihenxieTad. 



Sandy strata around Ohinnock & Stoke Knap . as late as scissi hemera. 



T) J i. a J f late DumortiericB hemera 



Bndnort Sands \ . ,. ./• . , 



^ [ to opaiin7j()rmis hemera. 



Upper Lias Clay of Down Cliffs early Dwrnortierio' hemera. 



^ , , 1 T /-I u 1 J \ J f stri(jtuli heuiern to aalensis 



Cotteswold Oephalopod-bed i , 



For reference I give the hemerae in sequence from the latest to 

 the earliest : — scissi, opallniformis, aalensis, Moord, Dumortieria?, 

 dispansi, Struckmanni, striatuli, variabilis, Lilli. The aramonite- 

 succession which these names indicate is found regularly in this 

 country, in Normandy where the strata are complete, and evidently, 

 from Quenstedt's works, in Wiirtemberg. 



The difference in the Sands mapped by Prof. Hull under the same 

 name may be expressed in another way. According to the division 

 of Lias and Interior Oolite adopted by Oppel and other German 

 geologists, the Sands of the North Cotteswolds are Inferior Oolite, 

 those of the Mid-Cotteswolds Upper Lias. Or again, the Sands of 

 the North Cotteswolds are of the Aalenian Stage, or Ludwigian 

 Age ; those of the Mid-Cotteswolds, of the Toarcian Stage, or 

 Harpoceratan Age.' 



VII. Appendix II. — Dates of some Eeosions in ' Jurassic' Time. 



(a) The Arietidan Epoch (Eojorassic Series), 



Dates. 



Localities. 



Notes. 



Fre-armati hemera. 



Eadstock. 



Near the shore-line of the 

 Mendips. Localerosion not 

 uncommon at several other 

 dates. 



'Pre-ibex „ 



Gloucestershire. 



No Jamesoni-heds. 



'Pre-spinati „ 



Dorset coast ; 

 Dundry. 





Pre-falciferi „ 



Dorset coast ; 

 Dundry. 



And perhaps more extensive. 



Pre-striatuli „ 



Dorset coast ; 



The bifrons-heda being in a 





Dundry, etc. 



more or less remanie con- 

 dition ; the Lilli and varia- 

 6?72S-beds being absent. 





Cotteswolds. 



Slight : —erosion of vartabilis- 

 beds, and pebbles. 



^ See * Grouping of some Divisions of so-called Jurassic Time ' Quart. Journ. 

 Geol. Soc. vol. hv (1898) Table I. 



