UPPER PORTION OF DUNDRY HILL. 231 



hemerae) with the well-known Ironshot Oolite (of the date of the Sauzei 

 hemeras), a bed nearly 100 feet higher up. 



(c) That in consequence of this mistake they have, round the greater 

 part of the hill, drawn the base of the Inferior Oolite as far below the 

 Marlstone as this base ought to have been drawn if the Marlstone were 

 really the Ironshot Oolite or Sauzei-hed. 



(d) That the Survey have mapped as Inferior Oolite strata which are 

 marked by them elsewhere as Lower Lias, Middle Lias, Upper Lias, and 

 Midford Sands. 



{e) That the superficial extent of the Inferior Oolite has been greatly 

 exaggerated on all previous maps. 



6. That at Dundry Hill the sequence of strata laid down 

 during Bajocian-Bathonian ages is incomplete, because there 

 is no deposit to represent the time of the niortensis or 

 IIu7)iphriesiani hemerae; in fact, presumably, during these 

 hemerae denudation was in progress at Dundry. 



7. That all the strata of the Aalenian and Bajocian ages 

 have been removed from the eastern end of the hill, so that 

 strata of Bathonian date (Garantiance hemera) rest non- 

 sequentially upon deposits laid down during the Dumortierice 

 hemera. 



8. That this removal has been effected by denudation in 

 Bajocian and even post-Bajocian time. 



Postscript. — In this paper we have substituted the term Pliensbachian 

 for Charmouthian, which was used by us in our communication to the 

 Geological Society. Mr. H. B. Woodward, F.R.S., has kindly given us 

 the following information: — "In the last volume published by the In- 

 ternat. Geol. Congress (Zurich) there is appended a Table of Strata by 

 Renevier. He adopts the term Pliensbachian of Oppel, 1858, ^ for both 

 Liasian and Charmouthian— these two being put as synonyms." As 

 Pliensbachian was proposed some years before the term Charmouthian, 

 suggested by Mayer-Eymar in 1864, it has the right of priority ; and we 

 only do justice in acknowledging that right. Oppel's objection to 

 d'Orbigny's prior term Liasien, that it is really applicable to the whole 

 of the Lias and not to a part, is justifiable, quite warranting his pro- 

 posal of a new term Pliensbachian. 



^ Juraformation, p. 815: "Pliensbach, a village near Boll in the 

 Swabian Alps." 



