Yol. 52.] SUBMERGED LAND-SURFACES AT BARRY. 479 



10 inches in diameter). A Neolithic worked flint was found 

 by Mr. Storrie in this bed. 



The ostracod- and shell-marls occurring in this peat are best 

 developed in the southern angle of the excavation. As the peat-bed 

 approaches the flanks of one of the rock-shoals previously referred to, 

 it curves slightly upward, and in such cases the shell-marls thin 

 out; at the same time logs of wood become more abundant. It 

 may be supposed that these slightly inclined portions of the peat 

 were formed at the margin of the water in which the shell-marls 

 were accumulating, and that the logs were stranded in the positions 

 which they now occupy. 



The worked flint referred to was found by Mr. John Storrie after 

 I had left the district. He picked it out from the peat (5 d), three 

 inches below the shell-marl, aud within half a yard of it noted a 

 stone containing glauconitic grains in the shell-marl (5 c). The 

 implement is made from a light grey chalk-flint, derived possibly 

 from the drift-deposits of the district. Sir John Evans, to whom 

 I showed the specimen, determined it to be a broken fragment 

 of a polished celt, and Prof. Hughes further pointed out to me that 

 it seems to have been used subsequently as a strike-a-light. The 

 fragment is only about an inch long, but shows parts of the two 

 ground faces of the celt, and of one of the ground edges ; it can be 

 matched exactly in shape (and, as it happens, in colour) by a 

 polished celt from Mildenhall in Suffolk, which was given me for 

 comparison by Prof. Hughes. 



It may be mentioned here that two bone-needles, now in the 

 •Cardiff Museum, are said to have been found in this peat-bed during 

 the construction of the first Barry Dock. 



The only bone which I have seen or heard of was a fragment of an 

 antler, probably of red deer, which had been thrown aside by the 

 workmen. It clearly came from some part of the freshwater series. 



The ostracod-marl (5 b) has been examined for me by Prof. Rupert 

 Jones, F.R.S., who furnishes the full list of forms given in the 

 Appendix. The brackish or freshwater Cytheridea torosa, Jones, 

 forms the bulk of the deposit. The shell-marl {be) is considered by 

 Mr. Clement Reid to have been formed in a nearly freshwater tidal 

 marsh. It consists mainly of Limnaea and decayed Chara. He 

 determines also the following shells and plants : — 



Succinea eleyans. 

 VeUetia lacustris. 

 Limncea auricularia. 



peregra. 



Planorbis albiis. 



nautileus. 



nitidics. 



Valvata pvscinalis. 

 cristata. 



Bythinia tentaculata. 

 Entoraostraca. 



Bitmcx crispus. 



Atriplex. 



Salix. 



Potamogeton. 



Naias marina. 



Chara, two speoies. 



Mr. Reid remarks that the occurrence of the pine (as identified 

 toy Mr. Storrie) and of Naias marina, both plants unknown in Wales 

 during the historic period, suffices to distinguish this peat from any 

 recent deposit. 



