The Chale Bay type section of the Lower Greensand Group (LGS) Atherfield Clay, Ferruginous Sands and Sandrock formations is characterised by members, bounded by hiatuses, formerly recognised (if not named as such) by Fitton as his ‘groups’ and Casey in defining ammonite zone and sub-zone boundaries. Subsequent work has shown that some of the formations of the LGS are recognised elsewhere on the Isle of Wight, in southern England and in northern France. Likewise, some members of the Atherfield Clay and Ferruginous Sands formations can be recognised beyond the Chale Bay type section. In this work, we have measured outcrop gamma-ray emission from the type section: gamma-ray peaks recognised on all datasets are used to attempt a correlation of the Lower Greensand Group between the Isle of Wight and an offshore borehole (99/16-1). This is partially successful, showing that Fitton and Casey’s stratigraphy maybe recognised basin-wide.

下格林桑德集团（LGS）阿瑟菲尔德粘土，铁质砂岩和沙岩地层的Chale Bay型剖面的特征是，其成员以裂隙为界，以前被Fitton认为是他的“群体”（如果不是这样命名的话），而Casey在定义时炸药区和分区边界。随后的工作表明，LGS的某些编队在怀特岛的其他地方，英格兰南部和法国北部被认可。同样，在查尔湾类型剖面以外，还可以识别出Atherfield粘土和铁质砂岩地层的某些成员。在这项工作中，我们测量了类型剖面的露头伽玛射线辐射：在所有数据集上识别出的伽玛射线峰值用于尝试将怀特岛与海上钻孔之间的下格林桑德群相关（99 / 16- 1）。