218 



From these sections we observe that the three zones abeady 

 described, are present in the departments of the Cote-d'Or and 

 Haute-Saone, and extend into those of the Doubs and Jura, as 

 shewn in M. Maecou's memoir on the Jura salinois ; the upper 

 zone attaining a considerable development in that region. M. 

 Martin's cabinets contain a very fine series of fossils from all 

 the three divisions. Many of those from the Echinidian and 

 Coral zones were forms well known to me, from their specific 

 identity with some of the Echinidse and Anthozoa of our own 

 Coralline Oolite. I was not unfamiliar with the large Nerinseas 

 and Diceras from the upper zone, as M. Etallon had, several 

 years ago, sent me a very fine series of Mollusca and Polypifera 

 from the Diceratien zone of the envu'ons of St. Claude in the 

 Haut-Jura. 



Coralline Oolite. — This important member of the English 

 Oolitic system was described by Dr. William Smith as "Coral 

 Eag and Pisolite," and by Conybeare and Phillips as "the 

 Superior or Oxford Oolite with Calcareous Grit and Sand, 

 forming the lowest beds." It comprises a series of strata from 

 one to two hundred feet in thickness, ranging obliquely north 

 and south from Weymouth, in Dorset, and passing through 

 the counties of Wilts, Oxon, Berks, and Bucks to Yorkshire, 

 where it is weU developed and exposed. Near Calne, Wilts, 

 it consists of— 1st, Calcareo-siliceous or Upper Calcareous Grit, 

 underlaid by a band of 10 feet thick of ferruginous clay ; 2nd, 

 Coral Eag composed of thick- bedded oolitic freestones and rubbly 

 Oolite, about 80 feet, resting upon irregular beds of rubbly 

 OoHte, 40 feet thick, containing corals; 3rd, Clay and fissile 

 Oolite, 40 feet, containing the tests and spines of numerous 

 Echinidse, as Cidaris florigemma, Hemicidaris intermedia, 

 Psendodiadema versipora, &c.; and, 4th, Lower Calcareous Grit, 

 consisting of sand, with beds of calcareous grit and impure 

 Limestone, containing large Ammonites perarmatus, and Star- 

 fishes, Astropecten rectus,— this formation passing into and resting 

 upon the Oxford Clay. The Coral Eag freestones, representing 

 the middle zone, are well seen at Calne : the corals, at Steeple 

 Ashton, and the beds with Echinoderms, representing the 



