The unusual age zonation is probably linked to the mineralogical association of monazite and apatite during metamorphic reactions. |
Took a small class out today to the bush so they could collect data for doing some credits on zonation. |
To address the latter question, it has proven useful to compare closely related species, especially congeners that exhibit temperature-related patterns of zonation. |
Test walls appear to lack compositional zonation, consisting mostly of small quartz grains with some incorporated sponge spicules. |
Most studies conducted on plant zonation have been within perennial-dominated coastal marshes or non-saline marshes. |
Internally, grains commonly show concentric compositional zonation, which is truncated at broken grain edges. |