This mod adds displayable fossils to the Prehistoric Nature mod. The fossils can be found as drops while breaking the Prehistoric Nature fossiliferous stone with a geologic pick. Fossils come in one or many parts: to begin just place the fossil like a block, and then add to it to gradually by placing matching parts onto it to assemble the full model. You can rotate the displays by right-clicking, and pressing F10 will show you where the main block is placed, which may be helpful to see for the larger ones.
Have fun!