Pollen dating method
The grains are very small, typically between 10 and 200 micrometers, which requires mounting them on microscope slides for examination.
To give you an idea of how small that really is, there are 1,000 micrometers in 1 millimeter, and a millimeter is about equal to the width of a pinhead.
Repeated rinses between some steps are used to remove fine clay particles from the sample and sample checks are used to determine if any step needs to be repeated.
Our procedure does not remove all siliciclastic material from the sample.
Sediment samples (usually 1.0 plastic centrifuge tubes and are treated sequentially, as shown in the flow chart below, with centrifuging and water rinses between each of the steps to clear the sediment of the treatment solution.
Repeated rinses between some steps are used to remove fine particles from the sample and sample checks are used to determine if any step needs to be repeated. Samples processed for AMS dates are processed differently than samples for counting, since no carbon-containing chemicals can be used.
These sub-microfossils are typically found preserved in abundance in a wide variety of wet and acidic sedimentary deposits, such as lake muds and peats.Pollen records within these materials can often be extremely difficult for palynologists to interpret, affected as they may be by problems such as poor pollen preservation or mixing (Dimbleby 1985).Where polleniferous material is stratified and can be securely dated, it can be used to build up a picture of how individual taxa and plant communities have changed over time.Success makes counting the pollen simpler, more accurate, and less time consuming.Processed samples are returned to the requester in silicone oil or glycerol for counting slides.