求地质专家把下面这段话翻成英语,大谢!

Neogene Yancheng group can be divided into upper and lower segments.The upper 451 m thick,its upper and central part of the brown,gray-green clay,silty clay and greyish yellow fine sand,coarse sand interbedded with gravel.Sand layer is mainly composed of quartz,feldspar and a small amount of dark minerals.The bottom of the conglomerate contains a lot more than 2mm in diameter quartz particles.Under section 543 m thick,mainly by gray siltstone,mudstone,fine-grained sandstone folder.It is integrated with the next overlying strata into contact with.