﻿220 DK. A. VATTGHAN ON THE PAL^ONTOLOGICAL [May 1905^ 



Horizon a. 



Prof. Lloyd Morgan found the ' Bryozoa-Bed,' and I have 

 verified its position. It contains Bhabdomeson and crinoid- 

 debris, as in the Avon section. 



Cleistopora-Zon e . 



Lithology. — Shales and thin limestones. 



Exposure. — The lower portion of the zone is entirely over- 

 grown ; the upper portion is partly, but very unsatisfactorily > 

 exposed in a low cutting at the side of the railway-line. 

 Fauna : — 



In the lower portion (K x ) I have unearthed fragments, 



containing Orthotetes and small Ghonetes cf. hardrensis. 

 mtheupper portion, octoplicata-subzone (K 2 ) : — 



Orthotetes , Leptena, Spirifer aff. clathratus, and Syringothyris 



an 2 , euspidata are very common. 

 Productus cf. Martini teems in certain beds near the top of 

 the zone. Gleistopora aff. geometrica also is abundant near 

 the top of the zone. 



Zaphrentis-ZoxiQ (Z) . 



i. clathratus-subzone (Z^. 



Lithological character. — Somewhat shaly limestones. 

 Exposure. — Not well exposed, except near the top. 

 Fauna: — 



Spirifer aff. clathratus and var., and Orthotetes crenistria 



(mut. Z) occur in enormous numbers. 

 Cliothi/ris Boyssii (mut. (3) and Gamarotoechia mitchel- 



deanensis occur occasionally. 

 Gliothyris glabristria, Schizophoria resupinata, Bhipidomella 

 aff. Michelini, and Zaphrentis aff. Phillipsi are frequently 

 met with at the top of the subzone. 



ii. resupinata-svihzowQ (Z 2 ). 

 Lithological character. — Limestones. 



Exposure. — Excellently exposed in a quarry at the side of 

 the railway-line. 



Fauna : — 



(1) Extremely abundant : 

 Zaphrentis aff. cornucopia. 

 Zaphrentis aff. Phillipsi. 

 Orthotetes crenistria (ruut. Z). 

 Cliothyris glabristria. 



Schizophoria resupinata. 

 Syringothyris aff. cuspidata. 

 Chonetes cf. hardrensis. 



(2) Scarce : 



Spirifer aff. clathratus and Bhipidomella aff. Michelini. 



(3) Syringotliyris aff. laminosa is abundant at certain levels. 



