INTERIOR AMBER SHAPES
The majority of amber, including the largest pieces, formed an the Inside of tree trunks.
They are not clear, have no indusians and are revealed only when the wood decomposes.
Interior amber shapes:
Wood lenses. These formed between tree rings when resln channels became clogged and under high pressure conditions.
Sub-bark amber formed when the resin flowed under the bark. Splinter remains are ofken contained within these pieces.
Bark amber formed when resin filled gaps and empty spaces in the bark. The surface of these pieces sometimes features imprints of the bark plates.
(Source: Lithuanian Art Museum, pgm.lt)