286 REV. R. A. SULLEN ON A WELL-SECTION [Aug. I9OI, 



Some of the Boulder-Clay contains cretaceous matter in the form 

 of ' race.' In places flat masses of fibrous gypsum were found, as 

 well as tabular iron-pyrites. One fragment of selenite much 

 resembles the selenite from the London Clay of Heme Bay and 

 elsewhere. 



The sands underlying the Boulder-Clay yielded no fossils of the 

 Crag Series. 



The stones from the Boulder-Clay were submitted to Prof. T. 

 llupert Jones, P.E-.S., who reports as follows : — 



No. 1 is a micaceous sandstone, possibly from the Coal-Measures of the Lower 

 Carboniferous Series. • 



No. 2 is an argillaceous rock, micaceous and partly calcareous ; laminated, 

 a dense micaceous shale. 



No. 3 is a quartzose sandstone with red cement, and with some white grains 

 (felspar ?) ; micaceous. This may possibly be Bunter Sandstone. The bluish 

 coating of all is calcareous and argillaceous. 



At my request Mr. Frederick Chapman, A.L.S., F.R.M.S., 

 made a detailed microscopic examination of the sands, stones, and 

 bituminous shale. The reason for examining the last-named was 

 to ascertain whether the burning properties were due to the 

 presence of ostracoda, as these entomostraca have been found very 

 abundantly in the oil-shales of the Scottish Coal-Measures. His 

 detailed report is as follows : — 



(A.) Eock-Specimens from the Boulder-Clay at 



Dallinghoo. 



[The numbers 1-3 correspond to the specimens described by Prof. T. Rupert 

 Jones,] 



1. An argillaceous gritty sandstone, with some mica; probably of Car- 

 boniferous age, 



2. A laminated argillite, containing mica between the laiuinge. Some 

 obscure foraminifera and ostracoda are present in this rock. One of the 

 foraminifera appears to be Haplojjhragmium aggluti7ians. Other organic 

 remains are referable to echinodermata and mollusca, of either Carboniferous 

 or Jurassic age. 



3. A ferruginous and micaceous sandstone, with bedding-planes strongly 

 marked. In thin section the quartz-grains are seen to be angidar ; some are 

 in a state of strain, and show ' ripple '-structure under polarized light; more- 

 over, granules of microclinic felspar and much muscovite-mica are present in 

 the rock. This specimen resembles some fine-grained Triassic sandstones 

 (Bunter Series). 



(B.) Specimens from the Sand at Dallinghoo. 



1. A Cretaceous chert with numerous sponge-spicules and foraminifera. 

 Among the latter is a very perfect specimen of Textularia trochus seen in 

 vertical section in the slide. 



2. A pebble of flint, consisting almost entirely of a lithistid ^ sponge. In the 

 hollows of the sponge are numerous outlines of foraminifera, seen in thin 

 section. These foraminifera appear to be in nearly all instances Globigerina 

 cretacea, of Cretaceous age. 



^ Dr. Gr. J. Hinde, F.R.S., concurs in this determination. 



J 



