Hardgrounds, reworked concretion levels and condensed horizons in the Jurassic of western India: their significance for basin analysis

Article Abstract:

A study of biota concretion layers coupled with observed condensation phenomena in the pericratonic basins of western India showed evidences of low-level eustatic changes in the sea level during the Jurassic Period and offered evidences of teutonic activities attributed to sea floor spreading taking place between the African and Indian continents. The study also showed the importance of hardgrounds, concretion levels and condensed horizons in the study of sedimentary basin history.

Natural history, South Asia, Asia, Southern

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Nature and origin of a laterally extensive alluvial sandstone body in the Middle Jurassic Scalby Formation

Article Abstract:

A study was made of a Scalby Ness sedimentation formation from the Middle Jurrasic Period which revealed meander-belt characteristics applicable to other studies of meander formations. Point bar deposits were shown to be a major part of meander belts, but were not necessarily dominant characteristics while rarely preserved counter point bars can be recorded on rock structures and offer additional information on the meander architecture.

Meandering rivers

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On the periodicity and magnitude of Late Carboniferous glacio-eustic sea-level changes

Article Abstract:

A study of sediment basins in areas from northern England, the Appalachians and Midcontinent U.S. was made using Walsh power spectral analysis to determine sea level change time tables. Magnitude determination through the use of lithofacies on known or derivable Paleozoic period sea levels in the Pennine Basin in England showed a long-term harmonic change consistent with values attributable to orbitally forced glacio-eustatic changes.

Analysis, Usage, Sea level, Power (Mechanics), Power systems (Mechanical), Carboniferous period, Walsh functions

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