The fossils of very old sea creatures are more likely to be found in rocks.
Basically, Fossils in rock gives information about what animals or plants lived in the past.
The reason is because when those organism dies, they decay and form silts which goes deep into the lithosphere.
Some Fossils of very old land creature usually ends up in the ocean through carrying agent like stream, winds, air. But fossils of very old sea creature will sinks to bottom and forms part of the rock.
Therefore, in conclusion, it is more likely to find fossils of sea creatures than those of land creatures on rock because of the process.
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