Simple flotation in water combined with a submerged sieve is now standard practice for the recovery of both biological and archaeological remains in the field.

Using a flotation tank in northern Syria to recover charred plant remains from archaeological sediment at Jerf el Ahmar

Charred plant remains essentially seeds and charcoal are collected in a sieve.

Residue which does not float and which is trapped on the submerged sieve is then sorted for small animal bones and archaeological objects. Daniel Helmer and George Willcox.