EESA06H3 Lecture 6: EESA06 Lecture 6 Notes
Document Summary
Fossils: how they are formed: a cavity is filled in with minerals such as calcium carbonate and silica or iron. Colour of the fossil doesn"t have anything to deal with the colour of the creature, it is the chemical of the rock: as more sediments pile up, there are more pressure and lithication: turning something into a rock. The bottom rocks get crushed and eventually become lithified and become a sedimentary rock. 4. 56 bya: no magnetic field, a lot of meteorites hitting earth. Sir james dawson: decision of the oldest fossil 1858) eozoon canadense. The dawn animal of canada": now recognised as mineral not organic: not fossil, prokaryotes: earliest bacteria. It is called the dubio fossil www. notesolution. com: they are microscopic, single celled, no nucleus, earliest prokaryotes; archaea lived in mid ocean r idges with all magma pushing aside ocean crust. No oxygen and light but living in sulphur.
