Reports and Proceedings — Geological Society of London. 187 



The specimens comprised : — (a) Fragment of a boulder from the 

 Free Harbour of Copenhagen, consisting of rock from the zone of 

 Crania tuberculata, and containing many unrolled echinoderm 

 fragments ; it appears to have been formed in shallow water ; 

 (6) fragment of a boulder from Langeland, consisting of rock 

 of Palseocene age, and containing rolled fragments of Cretaceous 

 echinoderms with shells of Tertiary molluscs ; (c) fragment of 

 a similar boulder, showing signs of further detrition ; (d) fragment 

 of a boulder from the island of Etigeu, with echinoderm fragments 

 still more rolled. All these rocks appear, from the distribution of 

 the boulders, to have been deposited in a basin of the Baltic 

 between Scania and the islands of Riigen and Bornholm, where the 

 Palseocene sea was shallower than on the west of Denmark. 



The following communications were read : — 



1. " On the Order of Succession of the Manx Slates in their 

 Northern Half, and its Bearing on the Origin of the Schistose 

 Breccia associated therewith." By the Eev. John Frederick Blake, 

 M.A., F.G.S. 



The author first describes a section where the Barrule Slate, the 

 Snaefell Laminated Slate, and the Agneash Grit follow in 

 descending order, dipping north-westward. The last-named is 

 markedly laminated. The ascending series, by dip, is again repeated 

 after a fault, and at Tholt-y-will the Schistose Breccia appears near 

 or at the top. The best sections of the latter for stratigraphy are in 

 Glen Auldyn and Sulby Glen. The Schistose Breccia is therefore 

 taken as an additional upper member of the series. 



General Distribution of the Manx Slates. — The Agneash Grit in 

 Maughold Head is nearly vertical, and is followed by the Snaefell 

 Laminated Slates. The height to which the Barrule Slates attain 

 diminishes from east to west. The Schistose Breccia depends on the 

 presence of those slates ; its occurrence is noted in four areas to the 

 west of the Barrule Slates, which are repeated by faults. 



The position of the Lonan and Niarbyl Flags is indicated by two 

 colours on the map. The Lonan Flags, etc., are never seen under- 

 lying the Manx Slates, but they overlie the earlier Manx Slates in 

 the lower country near Maughold, near Sulby Glen, and north of 

 Peel. They may, therefore, be called the Sulby Glen Series. 



Characters and Origin of the Schistose Breccia. — Professor C. E. 

 Van Hise gives three criteria for autoclastic rocks, with none of 

 which do the Schistose Breccias agree, namely, the fragments of an 

 autoclastic rock must be derived from the adjacent material ; 

 whether they be below or above ; and the rock itself may be traced 

 into an ordinary brecciated rock. The fragments examined do not 

 agree with this statement. The rocks are not truly conglomeratic — 

 some are too soft, or others too hard. 



Examples at Ballaneary and elsewhere occur, of true autoclastic 

 rocks, showing contrast. 



2. "On the Wash-outs in the Middle Coal-measures of South 

 Yorkshire." By Francis Edward Middleton, F.G.S. 



