Cretaceous and Palaeogene resins sometimes contain numerous inclusions of prokaryotic filaments. These abundant inclusions are largely considered to be undeterminable in the previous literature or have been only putatively assigned to extant groups.

Branched prokaryotic filaments in Cretaceous amber from Japan.
Julia König
However, excellently preserved prokaryotes in amber show many morphological features and several taxa can be distinguished. In the course of my diploma thesis I investigate the morphology and composition of these inclusions. Documentation and evaluation of morphological features of various taxa of prokaryotes in amber comprise a main part of my research. Furthermore, biomarker analyses of these abundant amber inclusions are carried out in order to elucidate the nature and taphonomy of these organisms.