Yol. 52.] ON THE UPPER PORTION OF DUNDRY HILL. 697 



diagram. However, we have found that the Ironshot rubble occurs 

 in a ploughed field \ mile east of Walnut Farm. 



West of East Dundry, as before stated, we have found that the 

 Ironshot Oolite does not extend to the freestone-quarry near the 

 church. How far east of that it disappears we can only suggest 

 in the diagram, since there are no data available after passing the 

 northern roadside quarry. 



The line of Bajocian denudation consequently runs with a slight 

 easterly rise from the western end of the hill to East Dundry ; 

 then it continues practically level for a space, and finally it falls with 

 an easterly dip to Maes Knoll. It is indicated in the diagram by a 

 thick dark line. 



The one other point in connexion with this diagram which 

 demands our attention is the rapid easterly attenuation of the 

 Freestone. 



Y. The Stratigraphical Sequence at Dundry Hill. 



No one exposure shows the full thickness of the deposits which 

 we have examined, but by the correlation of the various sections 

 a generalized section of the hill is obtained (Table IV). 



From this Table it may be seen that there is a break in the due 

 sequence of deposits at Dundry Hill. As a matter of fact, this 

 break in the sequence is least in the middle of the hill ; but to the 

 west it is greater, in such wise that strata of the Garantiance hemera 

 rest directly upon strata of the Sonninice hemera ; while to the east 

 it is very marked — the strata of the Garantiance hemera lying 

 directly upon those of the Dumortierice hemera. 



YI. The Faunal Sequence at Dundry Hill. 



As Table I. (p. 694) has shown the different deposits which have 

 been laid down at Dundry Hill, together with the dates to which 

 we assign such deposits, it is now possible for us to show in 

 Tables Y. & Y a. the sequence of faunas which lived during the deposi- 

 tion of the strata in question. In part this list, which claims to be 

 only an approximate record, by no means complete, has been compiled 

 from the results of collecting during the work of noting the different 

 sections ; but much of it is based upon our knowledge of speci- 

 mens collected during previous years by ourselves and by other 

 geologists. 1 We are enabled to state more or less approximately 

 the geological date of the species so collected by observation of the 

 character of the matrix ; for it may be seen from our sections that 

 the deposits made during different times are easily recognizable by 

 their lithological characters. Cases of doubt of course occur, and 

 such cases are marked by the placing of a note of interrogation 

 before the generic name. 



1 We are indebted not only to those geologists by whose labours the Bristol 

 Museum has been enriched in the past, but also to those who have done so 

 much work at Dundry Hill in the present, Mr. J. W. D. Marshall, Mr. J. W. 

 Tutcher, Mr. A. Vaughan, B.Sc, and other members of the Bristol Geolo- 

 gists' Association, to whom' we owe our best thanks for kindly submitting 

 specimens for our examination. 



