Effects of Past Global Change on Life (1995) / Chapter Skim
Currently Skimming:
Pages 39-41
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 39... ...
Reduction or absence of vertical advection of toxic waters during deglaciation would have reopened many environments in the mixed layers to resettlement by organ~sms. GEOCHEMICAL EVIDENCE OF DEEP OCEAN VENTILATION Although the ocean surface and deep circulation suggested for the Late Ordovician glacial and subsequent nonglacial interval is essentially speculative and derived from proposed paleogeographic reconstructions, some direct geochemical evidence has been developed to support the proposed model.
|
From page 40... ...
The Fe, Mn, and V concentrations (Wilde et al., 1986) in the Ordovician-Silurian boundary interval shales at Dob's Linn are consistent with the assignment of each sample to one of the four clusters reflective of oxic and the sequence of increasingly more reducing anoxic depositional environments (Figure 2.31.
|
From page 41... ...
in the Dob's Linn OrdovicianSilurian boundary interval. These graptolites were survivors of the Late Ordovician mass mortality among graptolites (Berry et al., 19901.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.