Notices of Memoirs — H. Bolton — Bristol Coal-field. 557 



that the interpretation of the geological structure of the district 

 depends upon the correct determination of the age of this limestone, 

 and we seem so near obtaining what would be regarded a crucial test, 

 I am glad to announce that Professor Hughes has instructed me to 

 carry out some not very extensive excavations which we hope may 

 yield important results. 



I woukl like here to thank Mr. A. H. Bloomfield for the valuable 

 assistance he gave me during my recent visit to Creechbai-row, and 

 I strongly recommend anyone who is visiting Dorsetshire for the purpose 

 of studying its geology and collecting fossils to secure his services. 



nsroTioES oif ns/nB]vnoii?,S- 



I. — New Fauxal Horizons in the Bristol Coal-field.^ By 



Herbert Bolton, F.R.S.E., F.G.S. 



ri^HE well-known rarity of animal remains in the Bristol coal-field 



T 



is proving to be due rather to the concealment of the measures 

 beneath newer rocks than to any actual absence of fossils. 



In 1906-7 the writer determined the existence of four horizons each 

 possessing a marine fauna, between the top of the Millstone Grit and 

 the lowest workable seam in the Ashton district ; and further work 

 upon the beds lying above the Bedminster seam at South Liberty 

 Colliery, Bedminster, and at Coalpit Heath in the north of the basin, 

 has proved the occurrence of others. A section at South Liberty 

 Colliery is as follows : — 



Strata 127-4 



Black Shale with Anthracomya 

 Strata .... 



Grev Shale with Anthraeomya 

 Strata .... 



Dark grey Shale with shells 

 Strata .... 



Black shell-bearing Shale 

 Strata .... 



Bedminster Seam 



4-11 



337-8 



3-7 



'2-0 



2-8 



150-0 



3-6 



134-4 



3-0 



At Coalpit Heath, a black shale forming the roof of the High Yein 

 (Hollybush Vein of Parkfiekl) has proved exceptionally rich in 

 specimens of Leaia Leidyi, var. Salteriana^ whilst Estheria cf. tenella 

 and Anthraeomya Fhillipsi also occur. 



II. — Studies on the Structure and Affinities of Cretaceous 



Plants.- By Marie C. Stopes, Ph.D., D.Sc, F.L.S., Lecturer 



in Palfeobotany, Manchester University, and K. Fujii, Ph.D., 



Assistant Professor of Botany, Imperial University, Tokio. 



rPHE authors comment on the importance of the work done on the 



J_ flora of the Palaeozoic period, and the botanical interest that 



would attach to similar petrifactions of plants from all ages of the 



1 Abstract of paper read at British Association Meeting, "Winnipeg, in Section C 

 (Geology), August, 1909. 



2 Abstract of paper read before the Royal Society, May 27, 1909 ; communicated 

 by Dr. D. H. Scott, F.R.S. 



