Brackish water faunas from the St Maughans Formation: The Old Red Sandstone section at Ammons Hill,Hereford and Worcester,UK, re-examined

The disused railway cutting at Ammons Hill, Hereford and Worcester, exposes a sequence of beds belonging to the Devonian St Maughans Formation of Lochkovian (Gedinnian) age. The beds are of Old Red Sandstone facies, but contain brackish water faunas. These faunas occur at a level generally considered to be above the level of marine influence that affected the older Raglan Mudstone Formation of mainly Přídolí Series age. The section, described by King in 1934, is now overgrown, but was excavated in 1986 by the British Geological Survey during its survey of the Worcester 1:50000 sheet. The evidence of the section calls for slight amendment of Allen's (1985) model of an interrupted transition from marine deposition in Ludlow time to freshwater deposition in Gedinnian time that was complete by the time of the formation of a regionally extensive calcrete palaeosol, the Psammosteus Limestone. Subsequent transgressive events took place before the establishment of apparently wholly fluvial and floodplain environments.     

邻苯二甲酸二乙酯(DEP)在罗非鱼(Oreochromis niloticus × O.aureus)体内代谢动力学和残留研究

采用反相高效液相色谱.紫外检测法,测定了罗非鱼血浆、皮肤、肌肉、心肌和大脑中邻苯二甲酸二乙酯(DEP)含量,并研究了DEP在罗非鱼体内代谢动力学和残留特征.将DEP以20mg/kg灌服罗非鱼后,取样测定不同时间点血浆和组织中的DEP浓度,并利用3p97药物动力学软件并结合Excel 2003软件对实验数据进行处理和分析...     

Palynofloras from tournaisian lacustrine and tidal sequences in slieve bloom,counties laois and offaly,Ireland

Tournaisian miospore assemblages are used to determine the age of some plant-bearing horizons in the Old Red Sandstone succession of the Slieve Bloom Mountains, Counties Laois and Offaly, Ireland, and the sedimentology and conditions of deposition of the productive lithologies are described. The age of the marine transgression which terminated continental sedimentation is indicated, and the associated depositional environment is discussed. Comparisons are made with other micro- and macrofloras from Ireland, Britain, Canada, the U.S.S.R. and Bear Island.