1996/12/01 by Lennart Jeppsson
Earth and Planetary Sciences · Environmental Science · #Paleontology and Stratigraphy of Fossils #Geology and Paleoclimatology Research #Isotope Analysis in Ecology
paper · doi:10.1111/j.1502-3931.1996.tb01666.x
The early Telychian graptolite extinctions discussed by Loydell in the Stimulograptus utilis Sub‐zone agree completely with the predicted consequences of a secundo–primo event, the first to be identified. The event would have included brief inhibitions in vertical circulation, causing a drop in primary planktic productivity from an already low level and causing extinctions; less well‐oxygenated deep waters would enhance preservation of organic‐walled fossils. The succeeding primo episode would instigate more vigorous vertical circulation with increased primary planktic productivity and higher downward transport of oxygen.