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img_54_bigUpper Lutetian is divided into two :

A series of organic limestones built from an accumulation of fossils, both small (milioles), and large (a variety of shells), which are used under the name of “construction stone”.
A series of marly limestone which resulted from the deposit of fine mud and rarely has fossils. It is called “marl and rubble” and is used for making crushed materials