Paleontology dating fossils Wechat fuck id
For permineralization to occur, the organism must become covered by sediment soon after death or soon after the initial decay process.The degree to which the remains are decayed when covered determines the later details of the fossil.Finally, past life leaves some markers that cannot be seen but can be detected in the form of biochemical signals; these are known as chemofossils or biosignatures.
The empty spaces within an organism (spaces filled with liquid or gas during life) become filled with mineral-rich groundwater.
Minerals precipitate from the groundwater, occupying the empty spaces.
If this happens rapidly before significant decay to the organic tissue, very fine three-dimensional morphological detail can be preserved.
Nodules from the Carboniferous Mazon Creek fossil beds of Illinois, USA, are among the best documented examples of such mineralization.
In this case the fossil consists of original material, albeit in a geochemically altered state.