In this paper, the AA. review the main features of a model which was derived from tholeiitic jurassic basalts found in Lesotho. They examine and discuss twinning of spheroidal weathering structures, concluding that the structures were formed during
has been constructed for the southern part of the area. Exhumed sub-Cambrian, sub-Jurassic and sub-Cretaceous inclined surfaces are cut by more horizontal surfaces at different levels.
With regard to its etchplain character, it is proposed by the A. that the development of the Baltic Shield relief can be ascribed to the chemical weathering that took place in Northern Europe during the Silurian-Carboniferous and the Jurassic
The A. shows how risky are the continental translation theory and the earthcrust expansion one. In compensation, the lunar origin of the Pacific, evident according to the A., and the evidence of marine tides on the early Jurassic shores
The AA. describe the occurrence of detrital chromian spinels from the Upper Cretaceaous Uzuhiki Formation and Lower Jurassic? Minokuchi Formation, and discuss their significance briefly.
Symmetrical peculiarities of planetary relief structure may allow to suppose that the main process of the Earth's development during the Post-Gondwanian epoc (middle Jurassic-Cenozoic period) was anisotropic expansion, mainly in the south hemisphere
In the province of Maine, during the Pleistocene cold episodes, many freeze-thaw cycles induced frost splitting of porous rocks such as jurassic limestones and palaeozoic rhyolite, and the frost wedging of non-porous paleozoic sandstones. Head
Investigations have concentrated on the Jurassic Portland Limestone outcrop of the Isle of Purbeck. Three types of data are considered, including mapped changes in the nature and location of the cliffline, material strength and the rock mass
The evidence provided by new studies, especially those carried out in middle and northwestern Poland, as well as in the Jurassic Upland, is that beginning from the Upper Pleni Vistulian aeolian quartz grain contents in fluvial sequences were
changes in drainage pattern, discharge and sediment yield and hat these can be related to a complex set of causative factors including the geological template, the Jurassic rifting of Gondwana, tectonic episodes and climate change.
sediments. The sea encroached and widened from the Indo-Australian Gulf in early Jurassic times. The formation is classified here as a distinct marine unit in the Upper Gondwana formations of peninsular India.
The Tübingen research group of the MABIS project examined mass movements on the Swabian Jurassic escarpment, the Keuper cuesta and the glacially formed Deggenhausen valley, using geomorphologic and pedologic field mapping, differentiation
of paleogeographic domains of the AfriacnMesozoic continental margin. the pre-orogenic successions show different types of deformation related to the Jurassic paleotectonicevolution of the southern Neotethys margin. - (NF)531276.
Data from the northern Tethyan domain indicate that Permo-Triassic Palaeo-Tethys closed between the late Triassic and the mid-Jurassic. This closure was caused by the collision with Laurasia of a Cimmerian continent rifted away from northen Gondwana
A dismembered metamorphosed ophiolite on Timor is connected with Jurassic rifting of Australia's northwestern margin. The rift developed into an ocean basin which carried a microcontinental block northwards. During the middle to late Cretaceous
The response of the Pacific plate to oceanic island and seamount loads has been used to estimate the distribution of ridge crest and off-ridge volcanism on the plate since the late Jurassic. The most extensive event, forming the Hess rise, Line
. Another controlling factor is the rock resistance - debris of less resistant rocks (marl, clay bolls) are weared out within a few kilometres and form suspended component of alluvium. Only gravels of most resistant rocks - Upper Jurassic limestones - caome