The collection consists of more than 15.000 top-quality specimens. They are all ordered and keeped after a code of conduct and rules of very strict standards RGDS-2008. Damjan is a specialist in area of sea urchins (Echinoidea), echinoids are actually the core of his collection.

The SloFos collection contains, in area of paleobotanica, these groups: Cyanobacteria, Chrysophyceae, Bacillariophyta, Coccolithophyta, Chlorophyceae, Chlorophyta, Dasycladales, Charophyta, Phaeophyta, Rhodophyta, whole Lycopodiopsida, whole Equisetopsida, Coniferopsida, Pinopsida, Taxopsida, Ginkgopsida, Cycadopsyda, Dicotyledoneae and Monocotyledoneae ...

... and in area of paleozoology: Textulariina, Involutinina, Fusulinacea, Miliolina, Rotalina, Porifera, Hydrozoa, Zoantharia, Polyplacophora, Monoplacophora, Gastropoda, especially Mesogastropoda, Bivalvia, especially Pteriomorphia and Palaeoheterodonta, Conhifera, especially Ammonoidea, Trilobita, Brachiopoda, Echinoidea, regular and irregular, especially Cassiduloida, Clypeasteroida and Atelostomata, Vertebrata, especially Mammalia.