Triassic plant fossils from Pollock Road,Southland, New Zealand

Pole. M. S., & Raine. J. I., 1994:03:28. Triassic plant fossils from Pollock Road, Southland. New Zealand. Alcheringa 18, 147–159. ISSN 0311-5518.

Sedimentary rocks of the Murihiku Supergroup considered to be latest Triassic (Rhaetian), crop out about 10 m below the Glenham Porphyry, near Glenham, New Zealand. They contain the vegetative macrofossils Marchantites sp. (Hepaticae), Pachydermophyllum praecordillerae (Frenguelli) Retallack and Pachydermophyllum benmorensis Anderson & Anderson (Peltaspermaceae), cf. Dicroidium dubium var. dubium Anderson & Anderson (Corystospermaceae), Desmiophyllum sp. cf. D. indicum Sahni (possible conifer), and Gingkophytopsis sp. (possible progymnosperm).

Reproductive material includes ovulate structures (Peltaspermum cournanei sp. nov.), pollenbearing structures (Antevsia sp.) and probably seeds of the Peltaspermaceae, ? Umkomasia (Corystospermaceae), and a possible progymnosperm microsporophyll.

The palynoflora is dominated by bisaccate gymnospermous pollen, mainly Alisporites spp., consistent with the presence of corystosperm macrofossils. Moderately common pollen of Cycadopites spp. may be of peltasperm origin.     

Deciduous Nothofagus leaves from the Miocene of Cornish Head,New Zealand

Pole, M.S., 1994:03:28. Deciduous Nothofagus leaves from the Miocene of Cornish Head, New Zealand. Alcheringa 18, 79–83. ISSN 0311-5518.

Nothofagus leaves with plicate vernation, indicating a deciduous habit, are recorded from the Late Miocene of New Zealand. This is the first unequivocal record in New Zealand of deciduous Nothofagus, deciduous species now being restricted to Tasmania and South America.     

Middle Ordovician faunal spatial differentiation in Baltoscandia and the Appalachians

The distributional differentiation of Baltoscandian Middle Ordovician shelly faunas in terms of confacies belts has a counterpart in the southern and central Appalachians, where three belts, parallel to the mountain chain, are distinguished: the Blount, Tazewell and Lee Confacies Belts. As in Baltoscandia, the boundaries between these belts are sharp. The Blount Belt high-diversity shelly macrofauna is closely similar to Scoto-Appalachian faunas of northeastern Ireland and southwestern Scotland (Girvan). The Lee Belt fauna is virtually the same as that of the North American Midcontinent, and that of the Tazewell Belt is transitional between those of the Blount and Lee Belts. The ecological factors causing the confacies differentiation are currently not clearly understood but the differentiation was evidently not due to a single factor such as water depth, although this factor was apparently important for second-order differentiation (biofacies) within a confacies belt. The spatial differentiation patterns of the shelly, graptolite, and conodont faunas do not always coincide, suggesting that the factors controlling the distribution were largely specific for each fauna.     

Tertiary gymnosperms from Tasmania: Araucariaceae

Three new species of the Araucariaceae are described from leaf remains, Araucaria readiae from the Early Eocene Regatta Point flora, A. hastiensis from the Middle-Late Eocene Hasties flora, and Agathis tasmanica from the Early Oligocene-Early Miocene Little Rapid River flora. Additionally, emended diagnoses are presented for Araucarioides linearis and A. annulata. A. readiae is the first organically preserved species in the section Eutacta described from Tasmania, A. hastiensis is the first record of a species not in section Eutacta in Tasmania, and A. tasmanica is the first record of Agathis in Tasmania. These species, along with other records from south-eastern Australia indicate the presence of a high diversity of araucarian species in the region in the Early-Middle Tertiary, although no species survive there today. Climatic change and competition from angiosperms may have led to their demise in that region.     

Botanical,malacological and archaeological zonation of settlement deposits at Gomolava

A 2 × 2 m column was excavated within the large-scale excavation carried out by a Jugoslav team at tell Gomolava, Hrtkovci, Jugoslavia, occupied from Vinc?a (c. 5000 BC) to post-Roman times. The archaeological zonation of the column's material is briefly outlined to provide the background to the detailed palaeobotanical, palynological and malacological study. The results of this study are used to aid the reconstruction of the palaeoenvironment of the tell. They indicate that the earliest agrobotanical zone, in which most of the cultigens were already present, but which is characterized by a very low count of charred seeds, persists throughout the Vinc?a, Baden and most of the Kostolac layers of the tell. A marked increase in charred seeds, without the appearance of new species, occurs in the next zone (Bronze and Iron Age). In zone 3 (Iron Age and Roman), Triticum dicoccum, Triticum aestivum and Lens culinaris attain significant levels.An interesting correlation between an increase in shade-loving snail species (zone B) and increase in building activity in the same level needs to be verified by further similar studies. This level is approximately that of the end of the Vinc?a occupation, but does not precisely correlate with an archaeological transition, suggesting that new building styles may have ante-dated the full development of the Baden cultural group on the site. During the third malaco zone (zone C) most shade loving snail species decrease abruptly to make place for open country species. The spread of these species could have been caused by the partial or total abandonment of the tell. Aquatic snails, which had first appeared in the lowest habitation layers of the tell become rare towards the subsequent bronze and iron age occupation of the tell, indicating that hardly any riverine clay was used for the construction of houses within these periods. The final malaco zone, representing the disturbed iron, roman and medieval periods indicates that again open grassy slopes must have occurred on or around the tell.     

Sampling seeds

Problems of sampling carbonized plant material are discussed. Firstly, the problem of actually selecting a sample in the laboratory is considered, and some experiments which investigate various procedures are described. Secondly, the statistical aspects of determining optimal sample sizes are considered. Formulae are given for calculating optimal sample sizes and confidence intervals. Upper bounds, which are independent of the total population size, are provided for the sample size required to achieve any desired accuracy.