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Because dogs didn't exist back then, more relevant analogies had to be used in that title. Why? Because analyses of Chengjiang and Burgess Shale food-web data suggest that most, but not all, aspects of the trophic structure of modern ecosystems were in place over a half-billion years ago.
Finding jellyfish fossils is "extremely rare" as the creatures are made up of roughly 95% water.
Mining Stock News: CopperCorp (TSXV: CPER) Awarded Razorback REE and Cu-Au Project in Tasmania, Australia with Historical Drilling Intercepts of 30.0m @ 2.1% TREO & 13.4m @ 1.6% Cu and 1.6 g/t Au
If you ever get a chance, spend some time looking at fish muscles in a microscope. Larval zebrafish are perfect; they're transparent and you can trace all the fibers, so you can see everything. The body musculature of fish is most elegantly organized into repeating blocks of muscle along the length of the animal, each segment having a chevron ("V") or "W" shape.
Historical records only go back a few thousand years, and are inadequate to treat most geological processes. To understand the timing of geological processes we need to look at the geological rock record. This includes erosion, mountain building and other geological events. Over hundreds to thousands of millions of years, continents, oceans and mountain ranges…