Inclusions (Latin Inclusus –closed-in, surrounded) is an addition in a mineral, for ex. An insect in amber piece. Inclusions aren‘t typical to amber, but any other fossil resin. They can be found not only in the Baltic amber, but also in the Canadian Ciderite, polar Siberian upper chalk Retinites, Alaskan Retinite, French resin, Sicilian Simetite, Austrian Eocene sap and other.
The flora and fauna conserved in amber 50 million year ago that survived to this day and its research help to unveil the climatic and geographical conditions of the time when amber trees grew, excluded amber resin and amber was created. The flora and fauna found in amber is similar to the current one because during millions of years its biggest part evolutionized slightly and the living conditions didn‘t change much.
Inclusions are found in limpid layered (trickled) amber that formed when sap periodically seeped out of the damaged tree parts. They‘re stuck to the liquid sap‘s deeper layer‘s surface and then covered by the new portion of the seeped resin. In the massive and variously colored and patterned amber pieces inclusions are rarely found.