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Unless you had an oxygen rich shallow sea by a river or volcano, then there was a sudden flood/eruption which dumped a huge amount of sediment, this would cut off the oxygen and everything would go temporily anoxic very quickly.
Yes, this is my view - a catastrophic mud slide seems very unlikely.
Yep, I am a geologist and biologist. (Biology for paleontology post grad studies.) Wanted to be a field geologist for the USGS before being hit with arthritis my junior year. Ended up in the oil business and sedimentology, with a heavy emphasis on my favorite subject, structural geology. Never liked the hard rock stuff. That is Bass's forte.
I don't know about this. For one thing, I thought the Burgess shale was a shale formed in anoxic conditions. To me it is counterintuitive that anoxic muds would bury life forms dependent on oxigen since the muds would have been formed in the anoxic zone. How are the critters going to live to be buried?
... the source of the gas is from the overlying Ordovician shales.
In the near future I might have a lead for you.