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Although the Isle-of-Wight Greensands have been well explored by eminent geologists, such as Fitton, Mantell, Ibbetson, and Saxby, there yet remains ample work for palæontologists in the classification of the fauna characteristic of each horizon. Hitherto the fossils from different zones have not been clearly separated, the collections from the Malm rock being mixed with those of the upper cherts and rags, and the Chloritic Marl with both. In forming a collection illustrative of the above series, it has been the writer's aim to divide every zone and to define the extent of each.
At the base of the section a band of chert nodules is indicated,measuring 2 feet, which is possibly the trim junction of Gault and Greensand, although in the Memoir on the Geological Suryey of the Isle of Wight 50 feet of mieaceous sands below this point have been included in the Greensand ; this has also been done more recently by Dr. C. Barrels, of Lille. It was from this section, exposed on the St.-Lawrence beach, that Captain Saxby procured a species of Crayfish; and a second specimen has been found within the lasteighteen months in the same locality. The importance of this horizon has apparently been overlooked ; for quite recently a further valuable addition has been made to the fauna by the discovery of a Chelonian previously unknown to pal~eontologists. From CaptainSaxby's day to the present time the locality has been neglected.About a year Mr. Mark Norman, a well-known local geologist,noticed a huge boulder
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