Well maybe because like cows do, some adventure off by themselves, and with younger cows they may forget where to head back. And if you think about it that leads to older cows which leads to new cow groups in different areas. Just like dinosaurs may have done.. Just a maybe
I think that there are fossils of the same animal in different plates because long ago the land was all connected (Pangaea). When an animal died and eventually decade the bones are in the dirt and when the land separated the bones didn't stay together.
For a typical tide of the period of the semidiurnal period for the solar active tides are about 24 and 12 hours as [er the equilibrium tidal theory and those of the semidiurnal lunar tides are about 12.4 hours period of the day.
The tidal ranges occur to form the two high to two low tides a day and semi-diurnal has two low tides each and every day.
