stratify

To form, arrange, or deposit in layers.

To preserve (seeds) by placing them between layers of moist sand or similar material.

To arrange or separate into castes, classes, or social levels.

To separate into a sequence of graded status levels.

To become layered; form strata.

To develop different levels of caste, class, privilege, or status.

To form into a layer or layers, as substances in the earth; lay or arrange in strata.

To preserve (tree-seeds) by spreading them in layers alternating with layers of earth or sand.

To form or deposit in strata, or layers, as substances in the earth; to arrange in strata.