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Animals with shells like this are mollusks, and mollusks whose soft bodies extend through an aperture at the shell's bottom are gastropods. In my little Golden Nature Guide to fossils the shell most resembling ours is a gastropod known as .Turritellas, which in geologic time have lived from the Cretaceous to the present, are described as "...slender, high-spired shells with incised sutures and with spiral or transverse ornament." By "incised sutures," is meant that between the spire's whorls the point of contact is a bit indented.The words "with spiral or transverse ornament," sent me looking with the hand lens to see what's shown below: The top of that picture is occupied by limestone rock, in which the fossils are embedded.Turritella Agate is a spiritual crystal, deeply connected to the earth and home, to one's personal roots and ancestry, even the events of one's past.It is a survival stone, one of strength and protection.Exposures of the richly fossiliferous Palaeogene sediments, which comprise the Bracklesham Group (Eocene), come and go unpredictably with the tides and weather. To the north, beyond Chichester, the ground rises to the Cretaceous chalk hills of the South Downs, while, to the south, across the waters of the Solent, the Isle of Wight stretches across the horizon. 3), although exposure of the fossil beds depend on having a good low tide and no cover of beach sand (Fig. The best low tides usually occur around 6am and 6pm, plus or minus an hour or so.

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The Bracklesham Group sediments are predominantly soft, silty clays and sands that were deposited between approximately 50 and 45mya (the Turritella Bed has been radiometrically dated at 46.4 ± 1.5myrs).The rock contains many fossils and fossil fragments, but a close-up of the three most conspicuous appears at the top of this page.The rock has broken or eroded so that nice longitudinal sections are provided of the ancient animals' shells.This was a time of minor sea level changes, with coastal sediments alternating with shallow marine sediments. The Wittering and Marsh Farm Formations are characterised by coastal sediments (including marsh, lagoon, tidal flats and tidal channel deposits).The Earnley and Selsey Formations are characterised by sediments of shallow marine origin.




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Common materials for radiocarbon dating are: The radiocarbon formed in the upper atmosphere is mostly in the form of carbon dioxide. Because the carbon present in a plant comes from the atmosphere in this way, the radio of radiocarbon to stable carbon in the plant is virtually the same as that in the atmosphere.


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