Figure 3 | Scientific Reports

Figure 3

From: Uppermost Triassic phosphorites from Williston Lake, Canada: link to fluctuating euxinic-anoxic conditions in northeastern Panthalassa before the end-Triassic mass extinction

Figure 3

Photomicrographs of phosphatic coated grains (PCG). All images are in plane-polarized light. (a) Fragmented phosphatic coated grains. Note size and shape variation. Sample PC 10. (b) Phosphatic coated grains embedded within phosphatic crust resembling grapestone structure with phosphatic peloids. Sample NPP17.5. (c) Light and dark brown concentric laminations. White arrow points to the divergence area where outer laminae replicate shape of a clast within cortex. Red arrow points to unaltered shell fragment within the cortex of phosphatic coated grain. Sample PC 7. (d) Phosphatic coated grain with irregular concentric laminations. Sample NPP 17.5. (e) Coarser grained P-rich sediment separated by scouring surface from underlying finer-grained sediment. Sample NPP 16. (f) Bivalve clasts filled with silt and peloids that were ripped up and transported by storms. PC7

Back to article page