Did you know that Portsea Island is probably the most geologically diverse city (am using my old school Geolgy ‘O’ level on this one!) in the UK, caused by the retreat of lowering seas from the last ice age, covering dinosaurs, their extinction and the birth of mammals in three sections?
Walking from South to North you go though sediments and bedrocks covering 67 million years.
Southsea area (ish!)… Eocene period 55.8 to 33.9 million years ago – The oldest known fossils of most of the modern orders of mammals appear in a brief period during the early Eocene and all were small, under 10 kg.
North End area (ish!)… Paleoscene period 65.5 to 55.8 million years ago, The K–Pg extinction event, brought on by an asteroid impact and possibly volcanism, marked the beginning of the Paleocene and killed off 75% of living species, most famously the non-avian dinosaurs.
Hilsea area (ish!) Upper Createous period 100.5 to 65.5 millions years ago. The oceans and seas were populated with now-extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land.