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- Cambrian_substrate_revolution abstract "The "Cambrian substrate revolution" or "Agronomic revolution", evidenced in trace fossils, is the diversification of animal burrowing during the early Cambrian period. Before this "widening of the behavioural repertoire", bottom-dwelling animals mainly grazed on the microbial mats that lined the surface, crawling above or burrowing just below them. These microbial mats created a barrier between the water and the sediment underneath, which was less water-logged than modern sea-floors, and almost completely anoxic (lacking in oxygen). As a result the substrate was inhabited by sulfate-reducing bacteria, whose emissions of hydrogen sulfide (H2S) made the substrate toxic to most other organisms.Around the start of the Cambrian, organisms began to burrow vertically, forming a great diversity of different fossilisable burrow forms as they penetrated the sediment for protection or to feed.These burrowing animals broke down the microbial mats, and thus allowed water and oxygen to penetrate a considerable distance below the surface. This restricted the sulfate-reducing bacteria and their H2S emissions to the deeper layers, making the upper layers of the sea-floor habitable for a much wider range of organisms. The upper level of the sea-floor became wetter and softer as it was constantly churned up by burrowers.".
- Cambrian_substrate_revolution thumbnail Ediacaran_trace_fossil.jpg?width=300.
- Cambrian_substrate_revolution wikiPageExternalLink 251.
- Cambrian_substrate_revolution wikiPageID "18177286".
- Cambrian_substrate_revolution wikiPageRevisionID "590848711".
- Cambrian_substrate_revolution hasPhotoCollection Cambrian_substrate_revolution.
- Cambrian_substrate_revolution subject Category:Cambrian.
- Cambrian_substrate_revolution subject Category:Evolutionary_dynamics.
- Cambrian_substrate_revolution subject Category:Paleontology.
- Cambrian_substrate_revolution comment "The "Cambrian substrate revolution" or "Agronomic revolution", evidenced in trace fossils, is the diversification of animal burrowing during the early Cambrian period. Before this "widening of the behavioural repertoire", bottom-dwelling animals mainly grazed on the microbial mats that lined the surface, crawling above or burrowing just below them.".
- Cambrian_substrate_revolution label "Cambrian substrate revolution".
- Cambrian_substrate_revolution sameAs m.04cv8kj.
- Cambrian_substrate_revolution sameAs Q5025316.
- Cambrian_substrate_revolution sameAs Q5025316.
- Cambrian_substrate_revolution wasDerivedFrom Cambrian_substrate_revolution?oldid=590848711.
- Cambrian_substrate_revolution depiction Ediacaran_trace_fossil.jpg.
- Cambrian_substrate_revolution isPrimaryTopicOf Cambrian_substrate_revolution.
