Editing Pollen core (section)

===Coring equipment===
There are a number of tools used for coring, often with specialized uses:

====Core samplers====
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* Glew corer:  A gravity corer used for lake surface sediments to capture the water-sediment interface.  Similar to the Kajak-Brinkhurst sampler.
* Brown corer:
* Frozen finger:  A tube is placed into the sediment and then filled with [[liquid nitrogen]] causing the sediment around the tube to freeze solid, preserving fine scale structure.
* Livingstone piston corer:  A long metal tube with a piston at the lower end.  Once the core tube is at the desired depth the piston is released and the barrel can be pushed downwards into the sediment.  Generally used for lake sediments.
* Russian:  A chamber corer used to sample [[peat]]s.

====Grab samplers====
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* Ekman grab sampler:
* Petersen grab:
* Ponar grab: