Publications
101 results found
Allison PA, 1988, KONSERVAT-LAGERSTATTEN - CAUSE AND CLASSIFICATION, PALEOBIOLOGY, Vol: 14, Pages: 331-344, ISSN: 0094-8373
Allison PA, 1988, THE ROLE OF ANOXIA IN THE DECAY AND MINERALIZATION OF PROTEINACEOUS MACRO-FOSSILS, PALEOBIOLOGY, Vol: 14, Pages: 139-154, ISSN: 0094-8373
Allison PA, 1988, PHOSPHATIZED SOFT-BODIED SQUIDS FROM THE JURASSIC OXFORD CLAY, LETHAIA, Vol: 21, Pages: 403-410, ISSN: 0024-1164
Allison PA, 1988, TAPHONOMY OF THE EOCENE LONDON CLAY BIOTA, Palaeontology, Vol: 31, Pages: 1079-1100, ISSN: 0031-0239
Allison PA, 1987, The taphonomy of soft-bodied fossil biotas. Ph.D. thesis
Actualistic experiments have quantified rate of decay and associated mineralization around macro-organisms. Carcasses of the polychaete worm Hereis, the eumalacostracans Hephrops and Palaenon, and the shredded leaves of Brassica olerica were sealed in airtight glass jars filled with sediment and water from marine, brackish and lacustrine environments. Over a period of 25 weeks the contents were examined to determine the state of decay and chemically analysed to detect early diagenetic mineralization. Decay processes were active within the experimental conditions despite the anoxicity and had virtually destroyed the carcasses within 25 weeks. However, decay rate within the sulphate-reducing marine system was 2-3 times higher than in the methanogenic freshwater environments. The results of these experiments were applied in 3 taphonomic case studies of Konservat-Lagerstatten, the Upper Carboniferous Mazon Creek of Illinois, the Oxford Clay of Wiltshire, and the Eocene London Clay of Kent. The case studies include a description of the level of preservation in different taxa as well as a diagenetic study of the minerals involved in fossil preservation. Such studies have shown that level of preservation is dependent upon original biological composition and the mineralogy of the fossilization medium. -from Author
Allison PA, 1987, A new cephalopod with soft parts from the Upper Carboniferous Francis Creek Shale of Illinois, USA, Lethaia, Vol: 20, Pages: 117-121, ISSN: 0024-1164
A ten armed fossil from the Pennsylvanian Francis Creek Shale and belonging to the famous Mazon Creek biota is described as a cephalopod. Apart from a superficial resemblance to the coleoids, there is little basis for an assessment of the animal's affinities. A mineralized Bask shaped structure preserved in calcite and seen in both part and counterpart in fragmentary form may represent the fossilized remains of an internal organ such as the stomach or ink sac A small, dark circular spot positioned anterior to the appendages could be the animal's eye although mere is no internal structure visible. The extremely rare occurrence of Palaeozoic cephalopods with soft parts has so far been Ended to the Francis Creek Shale and the Devonian Hunsrückschiefer of Germany. The Mazon Creek biota includes many fossils which show a remarkable standard of soft part preservation which in some cases includes the fossilization of eye spots and stomach traces. Previously deserted Mazon Creek cephalopods have included the tentacular impression of a squid complete with arm hooks, and the radulae and shells of both coleoids and nautiloids. The specimen described here is the first from the Palaeozoic to show any hint of organ preservation. Copyright © 1987, Wiley Blackwell. All rights reserved
Allison PA, 1987, A NEW CEPHALOPOD WITH SOFT PARTS FROM THE UPPER CARBONIFEROUS FRANCIS CREEK SHALE OF ILLINOIS, USA, LETHAIA, Vol: 20, Pages: 117-121
Allison PA, 1986, Soft-bodied animals in the fossil record: the role of decay in fragmentation during transport., Geology, Vol: 14, Pages: 979-981, ISSN: 0091-7613
Freshly killed, soft-bodied, and lightly skeletized animals display considerable resistance to skeletal damage during transport under experimental conditions. This resistance diminishes as decay advances. In addition, a high degree of decay-induced disarticulation may occur with minimal transport when carcasses are buoyed up from the sediment-water interface by decay gases. Decay, rather than nature or duration of transport, determines the completeness of fossil soft-bodied and poorly mineralized animals. -Author
Allison PA, 1984, Dimension stone-a rock steady market, Industrial Minerals, Vol: 200, Pages: 19-37
Allison PA, 1984, Fluxes in iron and steel-becoming a refined process, Industrial Minerals, Vol: 204, Pages: 81-97
Allison PA, 1984, Antimony-price recovery as production fails, Industrial Minerals, Vol: 198, Pages: 37-53
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