Did aquatic life forms get fossilised? If yes,where do we come across such fossils?

(N/A) Yes,aquatic life forms get fossilised in the sediments of water bodies. In fact,there are more aquatic than terrestrial fossil organisms.
Such fossils of sea creatures are often found in mountains rather than just deep sea beds,preserved within sedimentary rocks.
Historically,these organisms lived at the bottom of ancient oceans. Over geological time,tectonic movements pushed these ocean sediments upward to form mountain ranges,exposing the fossils.