102 CARBONIFEROUS LIMESTONE OF TYTHERINGTON DISTRICT. 
thin-bedded limestone overlies black bituminous limestone with 
abundant Lithostrotion. 
The Seminula-beds near Itchington are, as has been already 
mentioned, completely off the strike of those further west. They 
are best seen in an old quarry recently re-opened near Owlsnest 
Farm ; here they consist of compact limestone with china-stone 
and shale bands. Lithostrotion is plentiful and the lithological 
character suggests Si . 
Syringothyris-Zone. 
These rocks are well seen in the quarries and cuttings by the 
Tytherington railway, but other exposures are few and far 
between. We know of or^y two in the area between the railway 
section and Alveston, one being S. of the farm called Dodsmoor, 
the other in the grounds of Alveston House ; both these are in the 
Caninia-oolite. The extensive quarries W. of the Ship Inn at 
Alveston Green are opened in the main in the Camma-oolite which 
has quite the usual character, being very unfossiliferous and show- 
ing little in the way of bedding planes. The underlying 
Laminosa-dolomite is exposed at three points just to the N. of the 
road between Alveston and Old Down. Thin-bedded limestone 
sometimes dolomitic, seen near a new house 300 yards S.W. of 
Oldown House probably belongs to the Syringothyris-zone. 
We have no fossil evidence of the presence of these beds at 
Elberton. 
Zaphrentis-Zone. 
Passing westwards from the Tytherington-Grovesend railway 
section the first exposure of the Zaphrentis-beds is a very poor one 
at the southern end of Abbey Lane ; other equally bad exposures 
are seen in the bed of the small stream which flows towards Owls- 
nest Farm. Orthotetes crenistria, Chonetes hardrensis, and 
Spirifer clathratus are plentiful in the hedge-banks between these 
two exposures. A little further to the west the more easterly of 
the faults alluded to above shifts the outcrop, and the next 
exposure met with is by the side of the main road to Gloucester 
N.N.W. of Alveston House. 
In the grounds of The Chalet, Alveston, there are good 
exposures of the Zaphrentis-beds. The quarry near the road is in 
compact crinoidal limestone with chert, and in a temporary 
exposure to the S.K. of the house thin-bedded limestone with 
abundant Spirifer clathratus, Orthotetes crenistria, Cliothyris 
glabistria was seen, the dip being such as to bring the beds over 
the compact limestone of the quarry. Similar beds are seen in 
the grounds of a cottage near the tenth milestone from Bristol. 
Crinoidal limestone with the usual fossils of the Zaphrentis-beds 
occurs in an old quarry by Vattingstone Lane, N. of the Alveston 
