526 



Correspondence-^— Mr. A. J. Julies-Broniie. 



pehlithic, except in its upper portion, if the Portland and Purbeck 

 beds are comprehended in the same stage. The Coral Eag is only 

 an episode in the pelolithic series ; it is absent throughout a distance 

 of nearly 120 miles, and over this tract there is a complete passage 

 from the Oxford into the Kimmeridge Clay, and a commingling of 

 their respective faunas. No arrangement therefore will be natural 

 which separates these two clays. 



Lastly, if alternative names are required for the three stages of 

 the Jurassic system, such as are suggested by Mr. Blanford for the 

 similar stages of the other systems, I would propose the name 

 Clavinian (from Clavinium, the ancient name of Weymouth) for the 

 upper stage, the type of which is found in Dorsetshire and within 

 easy access from Weymouth. For the middle stage or Gloucester- 

 shire Oolites, as they have been called, what more appropriate name 

 can be found than one derived from the city which gives its name to 

 the county, namely, Olevonian. For the lower stage the term 

 Liassian already adopted on the Continent may perhaps suffice. 



I append a tabular view of this classification, in which it will be 

 seen that the Upper Jurassic simply combines what are now called 

 the Middle and Upper Oolites. This arrangement has also the 

 advantage of being in complete accord with that adopted by Credner 

 for Germany. 



r 



JTJEASSIC. ^ 



Teing, Oct. 2, 1884. 



Upper 

 or Clavinian. 



Middle 

 or Glevonian. 



Lower 

 or Liassian. 



r Purbeck group. 

 I Portland group. 

 ■{ Kimmeridge Clay. 

 I Coral Eag. 

 (.Oxford Clay. 



Great Oolite and Cornbrash. 



Inferior Oolite. 



Midford Sands or Dogger. 



Upper Lias. 



Middle Lias. 



Lower Lias. 



A. J. Jukes-Browne. 



OBia?TJ^^i^'2". 



DR. FERDINAND VON HOCHSTETTER. 



For. Corr. Geol. Soc. Lond., Director of the Imperial Mineralogical Museum, Vienna. 

 Born 30th April, 1829 : Died 18th July, 1884. 



T the close of last year we recorded the death of the illustrious 

 geologist Barrande (see Geol. Mag. Dec. 1883, pp. 529-533). 

 In Dr. Ferdinand von Hochstetter, Austria has again suff'ered a 

 severe loss, and the world of science mourns the death of one of its 

 most distinguished members. The subject of our memoir was born 

 at Esslingen, Wurtemberg, on 30th April, 1829. His father was 

 an Evangelical clergyman and Professor at Briinn, and published 

 several Botanical works and a Handbook of Mineralogy. To his 

 father was doubtless due his first impulses towards the study 

 of Natural Science : for although he commenced his education 



