Earth Scie,Nce Conservation

NATURE CONSERVANCY COUNCIL EARTH SCIE,NCE CONSERVATION No. 22 May 1985 CONTENTS PAGE Editorial The Granton Shrimp-Bed, Edinburgh 3 Conservation of Geological Features in the U.S.A. 9 Swanscombe Reserve Open Weekend 13 Fieldwork in National Parks 21 Practical Conservation and Site Adoption 23 Geological Guide to the East Mendips 27 Progress of the Geological Conservation Review 29 Public Inquiries 44 Major Casework 50 Field Facilities 57 Conservation ews 63 The Geology and Physiography Section, Foxhold House, Thornford Road, Crookham Common, Newbury, Berkshire RGI5 BEL The Geological Conservation Review Unit, Pearl House, Bartholomew Street, Ncwbury, Berkshire RG 14 5LS EDITORIAL 1. THE GRANTON SHRIMP-BED, EDINBURGH: Since the last issue of Earth Science Conservation was published in March 1984 a CRUSTACEANS, CONODONTS re-organisation of the Nature Conservancy Council's structure has taken place, AND CONSERVATION resulting in the Geology Branch being transferred to the Chief Scientists' Dr E.NK. Clarkson, Grant Institute of Geology, Directorate. The broad range of functions and activities of the Geology and University of Edinburgh Physiography Section and the Geological Conservation Review Unit remain essentially unchanged, but are now supported by increased resources. The main In 1859 a Russian geologist named Pander described some curious tooth-like change will be that both the Section and the Unit are being transferred to the NCC's fossils which he had isolated from the soft Lower Palaeozoic shales ofthe East Baltic. new Headquarters in Peterborough, with the Section moving early in September They were small (0.1-5mm long), made of apatite, and provided with one or more 1985 and the Unit early in 1986. The new address will be: sharp cusps. He assumed that they were the teeth ofsome extinct fish and he called Nature Conservancy Council, them conodonts. Pander's observations were excellent, and in interpreting them he Northminster House, only made one error, he believed that the apatite layers ofwhich the conodonts were Peterborough PEl 1UA constructed were secreted from the inside, as in the teeth ofvertebrates, whereas it is Tel. Peterborough (0733) 40345 now known that they were laid down externally from the outer surface of the conodont. He thought it possible that different kinds ofconodoilts might have been This issue of Earth Science Conservation follows the trend, established in previous present together in the same animal, and suggested that the animal that bore them editions, ofincluding both invited and unsolicited articles from outside contributors. had been bilaterally symmetrical; in these and many other respects he was very far vVe consider this to be a valuable way of stimulating discussion on conservation sighted. But Pander could not have known that his conodonts, now known to range in age from Cambrian to Triassic, would become the most stratigraphically useful of issues, and will be pleased [Q consider other contributions in the future. In this issue, Euan Clarkson writes on the discovery and conselvation ofan important locality all fossils for the time span they represented, nor that over ten thousand papers would yielding the first known specimens of the conodont animal, and describes how this be written on conodonts in the next 125 years. Perhaps he would not have suspected remarkable palaeontological story evolved. In item 2, Roger Cooper writes on either that the nature of the conodont animal would remain obscure until 1982. geological conservation as practiced in the U.S.A. and compares it with British The conodont animal was soft-bodied and decayed after death. Yet in rare methods. The Open Weekend planned for the Swanscombe Skull Site National instances the conodonts themselves were left in natural associations or assemblages, Nature Reserve inJune 1985, to celebrate the 50th anniversary ofthe discovery ofthe lying undisturbed upon bedding planes. These were first reported from Germany in first skull bone of 'Swanscornbe Man', is previewed in item 3, where Bernard 1934, and in the same year from America. It was shown that indeed the conodont Conway writes on the geological and archaeological significance ofSwanscornbe. In animal must have been bilaterally symmetrical and, as Pander had suspected, item 4, Eric Robinson, the Geologists' Association Librarian, provides a very useful several different kinds ofconodont lay in successive groups on either side ofthe axis of list ofaddresses to help leaders offield parties overcome potential access difficulties in symmetry. It was later suggested that conodonts must have grown by secretion from the National Parks. Item 7 contains a number of progress reports on component an external epithelium, but that they might have been able to have been extruded blocks of the Geological Conservation Review, each written by the contract worker from this (like a cat's claw) when needed for use. But having said this, what was their responsible fOf the block concerned. \,ye are most grateful to all these external function? Were they teeth? Might they have been some kind offiltratory apparatus? contributors. Or were th~supportsfor tentacles? There was no certain answer to these questions, but then in 1973 some specimens of a previously unknown animal from the The Geology and Physiography Section and the Carboniferous Bear Gulch L.imestone of Montana in the United States seemed to Geological Conservation Review Unit of the Nature provide at least a partial answer. The animals were some 4cm long and cigar-shaped, Conservancy Council would like to thank all those with a triangular central cavity; in the first specimens discovered this 'deltaenteron' who came to their aid in prolDoting earth science was found to be full ofconodonts. Were they then some kind ofgastric mill which had conservation through safeguarding, IDaintaining functioned in macerating the food ofthe animal? It seemed so at first, but as more of and improving the educational and research field these animals were found it became clear that not all ofthem had conodonts. Some of facilities of Britain. them were devoid ofconodonts, others had very many. The cigar-shaped animals of the Bear Gulch Limestone had eaten conodont animals, and that is why conodonts The opll'1lOns expressed by the contributors to Earth Science Consen'ation are not had remained inside them! necessarily those of the Nature Conservancy Council. A further lead came with the description, by Simon Conway Morris, of a strange animal, known, unfortunately from only one specimen, from the Middle ISSN 0142-2324 3 shrimp Waterstonella, (named by Fred Schram after the curator ofthe Royal Scottish Cambrian Buraess Shale of British Columbia in Canada. It was a flattened Museum, Charles Waterston), the stouter Crangopsis, and the large predator segmented ani~al with a curious twisted ring in the head, and bearing sharply Anthracophausia. This latter was normally preserved only as isolated parts. There were pointed 'teeth' as supports for the tentacles. Since there was only the one specimen it other components too, palaeoniscid fish, rare bivalves and gastropods, possible was not possible to remove these and analyse them to see ifthey were made ofapatite. So there the matter rested, until a chance find in an old collection resolved finally nematode worms and hydroids. It was a rare and unusual fauna, consisting of what the true nature of the conodont animal was. thin-shelled or soft bodied animals, and such 'Fossil-Lagerstatten' are rare indeed. We collected carefully from the small exposure on the shore, where the faunas tend to In the late 1970s my colleague Derek Briggs ofLondon University and I began a occur in patches. But we were worried that when our results were published, re-investigation of the Lower Carboniferous 'shrimp-beds' in the vicinity of excessive collecting might irreparably damage the site. Even though we did not state Edinburgh. Fossil crustaceans of Carboniferous age are generally rare,. but in the in our published work where the site actually was we had some fears that it might be Midland Valley ofScotland and along the southern border ofthe Southern Uplands discovered and plundered. there are several beds containing unusual assemblages of fossils, which include Meanwhile the most remarkable ofall the animals in the Granton fauna had crustaceans and fishes. Most of these assemblages are not of marine origin, but were come to light; the first known specimen ofa previously unknown soft bodied animal, deposited, usually close to the sea, in non-marine lagoons and ponds or in estuarine bearing conodonts in the head region, in a natural assemblage. This discovery came conditions. The crustaceans had been beautifully monographed by Ben Peach in about quite by accident. Derek and I were studying the large Anthracophausia, which 1908, but we thought that much more could be known about them using modern at the time was known at Granton only from fragments (though since then complete techniques of study including scanning electron microscopy. specimens have been found at Granton). However, some excellent complete The crustaceans are exquisitely preserved, and in two ofthc 'shrimp-beds' in the specimens had recently been found in an excavation at Bearsden in Glasgow, made Edinburgh district possess the original cuticle in its unaltered state, but with a filling by Scotland's well-known fossil collector Stan Wood. Knowing that the British off1uorapatite, resulting diagenetically from the post-mortem action ofbacteria. The Geological Survey in Edinburgh had large collections of Granton shrimp-bed first adaptive radiation of crustaceans of distinctly modern type took place in the material I asked Peter Brand, the curator, if I might examine this material to see if early Carboniferous, and we hoped to gain an insight into the nature of this great there were any further specimens ofAnthracophausia. On February 16th 1982 I visited evolutionary burst. \Ve had two main intentions, the first being to study the anatomy the Survey collections, and Peter and I examined all the slabs which he had kindly ofthe 'shrimps' themselves in great detail, to classify them and to establish their links, laid out.

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