Further Ektopodontidae (Phalangeroidea,Mammalia) from southwestern Victoria

The youngest members of the Ektopodontidae, an enigmatic family of Phalangeroidea, are reported from southwestern Victoria. Four isolated teeth are described as Ektopodon paucicristata sp. nov. (from the ?mid-?late Pliocene, and early Pliocene) and two isolated Pleistocene teeth are assigned to Darcius duggani Rich, 1986. Previously, the youngest known ektopodontid was early Pliocene.     

Reviews

Sam Smiles, The Image of Antiquity: Ancient Britain and the Romantic Imagination, New Haven and London: Yale University Press, 1994. x + 252 pp., 128 b. & w. illus. ISBN 0–300–05814–4. £35.00.

Marcia Pointon (ed.), Art Apart: Art Institutions and Ideology Across England and North America, Manchester and New York: Manchester University Press, 1994. 292 pp., 39 b. & w. illus. ISBN 0–7190–3918–5. f 10.99.

Daniel J. Sherman and Irit Rogoff (eds.), Museum Culture: Histories, Discourses, Spectacles, London: Routledge and Minneapolis: the University of Minnesota Press, 1994. xx + 301 pp., 26 b. & w. illus. ISBN 0–415–09274–4. £14.99.

Sheena Mackellar Goulty, Heritage Gardens. Care, Conservation and Management, London and New York: Routledge, 1993. 176 pp., 82 b. & w. illus. ISBN 0–415–07474–6. £19.99.

Anne Fahy (ed.), Collections Management, London and New York: Rontledge, 1995. xii + 304 pp., 2 figs. ISBN 0–415–11283–4. £19.99.

Annie E. Coombes, Reinventing Africa: Museums, Material Culture and Popular Imagination, New Haven and London: Yale University Press, 1994. vii + 280 pp., 112 b. & w. illus. ISBN 0–300‐ 05972–8. £35.00.

Lesley Hoskins (ed.), The Papered Wall. The History, Patterns and Techniques of Wallpaper, London: Thames and Hudson, 1994. 256 pp., 185 col. and 157 b. & w. illus. ISBN 0–500–23695‐X. £32.00.     

Estimating the Variability of Active‐Layer Thaw Depth in Two Physiographic Regions of Northern Alaska

The active layer is the zone above permafrost that experiences seasonal freeze and thaw. Active‐layer thickness varies annually in response to air and surface temperature, and generally decreases poleward. Substantially less is known about thaw variability across small lateral distances in response to topography, parent material, vegetation, and subsurface hydrology. A graduated steel rod was used to measure the 1998 end‐of‐season thaw depth across several transects. A balanced hierarchical sampling design was used to estimate the contribution to total variance in active‐layer depth at separating distances of 1, 3, 9, 27, and 100 meters. A second sampling scheme was used to examine variation at shorter distances of 0.3 and 0.1 meter. This seven‐stage sample design was applied to two sites in the Arctic Foothills physiographic province, and four sites on the Arctic Coastal Plain province in northern Alaska. The spatial variability for each site was determined using ANOVA and variogram methods to compare intersite and inter‐province variation. Spatial variation in thaw depth was different in the Foothills and Coastal Plain sites. A greater percentage of the total variance occurs at short lag distances (0–3 meters) at the Foothills sites, presumably reflecting the influence of frost boils and tussock vegetation on ground heat flow. In contrast, thaw variation at the Coastal Plain sites occurs at distances exceeding 10 meters, and is attributed to the influence of well‐developed networks of ice‐wedge polygons and the presence of drained thaw‐lake basins. This information was used to determine an ongoing sampling scheme for each site and to assess the suitability of each method of analysis.     

Late Silurian and Early Devonian biostratigraphy in the Hill End Trough and the Limekilns area,New South Wales

Precordilleran Late Palaeozoic brachiopod genera considered for this palaeobiogeographical analysis belong to four faunal associations: the low diversity Early Carboniferous (Tournaisian) Protocanites scalabrinii-Azurduya chavelensis Zone; the Late Carboniferous (Bashkirian-Moscovian) Levipustula fauna, which appears in sequences associated with glacial intervals; the latest Carboniferous-earliest Permian (Gzhelian-Asselian) Rhipidomella-Micraphelia and Tuberculatella-Aseptella associations, and the Early Permian (mid to late Asselian) Tivertonia jachalensis-Streptorhynchus inaequiornatus Biozone. The brachiopod affinities of the Precordillera are compared with the biogeographical Late Palaeozoic regions previously suggested by other authors using cluster analysis. During the Bashkirian-Moscovian, the Precordilleran faunas show a high affinity with the Austral Realm because of the presence of the Levipustula faunal elements in Eastern Australia. At the same time the affinity with the central and North American Regions is very low. The Early Permian Precordilleran faunas demonstrate highest affinity with the Gondwanan Realm with several genera also linked to the Tethyan and Boreal Realms. After the Late Carboniferous glacial episodes that affected the southwestern Gondwanan margin, the Precordilleran region underwent climatic amelioration. Subsequently, the Early Permian Precordilleran brachiopod assemblages are characterized by typical cool to cold water genera widely developed in the core Gondwanan Realm, with fewer genera (such as Kochiproductus, Rhynchopora and Neochonetes) suggesting a warmer water influence. The Precordilleran faunas demonstrate an increase in brachiopod diversity from the Carboniferous to the Permian, related to water temperature changes and to the palaeogeographical evolution of the southwestern Gondwanan margin and the movement of Gondwana across the South Pole.