GLGY 307 Lecture Notes - Lecture 13: Charnia, Annelid, Dickinsonia

• School: University of Calgary
• Department: Geology
• Course: GLGY 307
• Professor: M.Dan Georgescu

Document Summary

Oldest eukaryotes: oldest eukaryotes are biomarkers (chemical fossils, 2. 1 billion years, 1. 8 billion years. Bitter springs formation: the first isolated tue eukaryote cells were discovered in the cherts of the bitter. Eukaryotes examples: bangiomorpha, filamentous thallus, similar to those of thhe modern red algae, primitive holdfast attached to the seafloor, allowing the alga to rise upward towards the sunlight, age: ~1. 2 billion years, st: proterozoic-quaternary, torridonophycus. 1: algal microstructures escaping from a bag-like structure, which helped them to survive the dry climate, cold, etc, chlorophyte, age: ~ 0. 9 billion years, st: upper proterozic, melanocyrillium, shows similarities with the modern group of testate amoebas. For this reason, it is included among the earliest animals: organic, sometimes with agglutinated particles, age: ~0. 8 0. 9 billion years, st: upper proterozoic-quaternary. Ediacara dominant fossils: parvancorina, size: 1-2. 5 cm, shield-shaped front end, central axis and weak traces of segentation, up to 10 pairs of possible appendages with distinct set of growth stages.