Belfry Bulletin Number 202

Page 1

B

No 202 ? ? ? 196?

B

As you will appreciate from the heading, page one of this B.B. has had to be scrapped. It originally did things like wishing you all a Merry Christmas, but perhaps in view of the ill fortune that has dogged the production of this very belated Christmas Number, it might be safer to wish you a Happy Easter (or in, the case of members who get the B.B. by post, Whitsun). Not to bore you unduly, but what has happened is a temporary breakdown in the printing department of the B.B. also, as a result of changes here, it will not be possible to implement the plans for producing the B.B. by the Offset Litho process – at least not in the near future. So it is a case of ‘as you were’ and perhaps that’ll finally teach me not to natter on about the future any more! You will however, find some forms about the M.R.O. and the continental trip in this B.B. and also you are being asked for your comments on the subject of next year’s dinner. Please try to answer all these if you possible can as various arrangements depend on us knowing what you want and what you are prepared to do. In spite of the delay, the editor would like to wish all club members and cavers everywhere a very Happy and Prosperous New Year and good caving in 1965. “Alfie” _______________________________________________________________________________________

The Sequence of Development of St. Cuthberts [Part 2] Re-examination and Vadose Erosion. The great plug was finally broken, possibly by the simple pressure of the water that it impounded, possibly by the fall in the water table at the Wookey end of the system causing the choke to be sapped from downstream. The first re-excavating streams came down the Arête route and from the north east corner of Upper Traverse Chamber. Both cleared much of the fill in the central chambers and the western part of the Warren before re-opening the gravity favoured channels down Everest Passage and The Fingers and so clearing Main Stream Passage. A comparatively small stream removed the top six feet or so of fill in the Lake – Cerberus Hall section of the rift, flowing into the Main Stream through the Dining Room. Southeast of the Dining Room Junction the rift remained choked. The streams cleared it again at end below their final points of entry – Beehive Chamber. The gours for which the rift is named are thus stalagmite deposits on to a wall of fill left standing immediately upstream of the Beehive Junction. In the highest parts of the cave, there was little fill to clear. The streams instead expended their energy on the erosion of the cave. At the south end of the Wire Rift a great stream pothole was drilled by the water on its way to Pillar and Boulder Chambers. The drilling struck an extensive low-angle thrust which guides most of the Pulpit route from the second pitch to Lower Traverse Chamber. Water was diverted down it, tearing the bottom out of the pothole and opening a primitive route across Lower Traverse Chamber and out into Main Stream Passage at the lower Everest Passage Junction. This route (proto Pulpit) thus passed under Upper traverse Chamber without connecting with it during the early stages of formation. The ruptured pothole is Upper Mud Hall, now further modified by a hefty rock fall.


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