Cross sections cut through some of the fossils reveal that the mud filing the interior of the carcass differed in consistency and texture depending on its location inside the fish.
结构分析：
复合句，主句中含有that引导的宾语从句。
词汇讲解：
carcass: the dead body of an animal
consistency: the consistency of a mixture or a liquid substance is how thick, smooth, etc.
texture: the way a surface, substance or piece of cloth feels when you touch it
句子分析：
Cross sections cut through some of the fossils reveal
主句中，cross sections 主语，cut through some of the fossils 过去分词短语作定语修饰主语， reveal 是主句的谓语。 本部分的意思是：通过一些化石的横截面显示。
that the mud filing the interior of the carcass differed in consistency and texture depending on its location inside the fish.
宾语从句中，the mud 是主语，filing the interior of the carcass 现在分词作定语。differed 是从句的谓语， in consistency and texture 状语。depending on its location inside the fish, 状语。 本部分的意思是：由于在鱼体内的位置不同，填满尸体内部的泥在稠度和纹理上都有所不同。
参考翻译：
通过一些化石的横截面显示，由于在鱼体内的位置不同，填满尸体内部的泥在稠度和纹理上都有所不同。
