For the reconstruction of past climate two things are most important: one is the reproducibility of data, and second is authenticity of age model, or in other ways we can say age model is the backbone for the reconstruction of past climate.
In carbonate terrain, its very hard to establish the good age model, because lake catchments containing geologically old carbonate (e.g. limestone) can be a source of infinitely old, 14C-depleted, carbon for lake or pond water. So in that area, bacteria are the good source of study because once we trace there evolutionary trend we are able to correlate them with past climate.
Age model means chronology established by dating of sediment core at different intervals
For past climate reconstruction fossil bacteria need to be retrieved, do you think it is possible to retrieve fossil bacterias from down core depth of sediment core, may i know how to retrieve fossil bacteria from sediment cores, it seems to be intresting work, bio markers such as lipids, aminoacids can be also a better proxy
I am totally agree with Mr. Ishfaq. Age model is actually chronological order of sediment deposited in sediment core. Once we developed the chronology then it is easy to correlate the sediment deposited in the core with past climatic condition.
Mr. Ishfaq I think it is possible to retrieved fossil bacteria from the sediment core by culture method.
I would presume that bacteria are too dynamic in the sediments. Diatoms on the other hand, are preserved because of their siliceous shells. There's numerous sources that have used diatoms for millennial reconstructions, as well as pollen grains.
a coworker of mine works on that and he actually published something about this. It seems that at first microbial processes reflect climates and you can keep track of this. here is the paper by Vuillemin et al., 2012.
http://www.sciencedirect.com/science/article/pii/S0277379112001527
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