0 a line where two things join, especially a line of sewing joining two pieces of cloth or leather:
1 a long, thin layer of a substance such as coal that has formed between layers of other rocks
2 a line where two things join, esp. where two pieces of cloth or other material have been sewn together:
3 a long, thin layer of rock or another substance that formed between layers of other rocks:
a coal seam
The thinner seams also have a noticeable component of sphenophyll spores, indicating significant areas of open conditions allowing colonization by these scrambling plants.
The coal seams above p3 are not correlatable across the basin.
Note that the rock displays only one fabric: a matrix foliation of mostly thin mica seams and elongate quartz grains.
Clastic layers up to 10 cm thick are common within thick seams.
In thin-sections, the gneisses are cut by narrow pressure solution seams and narrow cataclastic shear zones.
The surfaces which appear as dark seams in hand specimen are stylolitic in mor phology and vary in width from 0.01 to 0.2 mm.
Only then will the limitations, error traps, and therapeutic seams surface, be recognized, and demand remediation.
Alteration of silicate phases is common adjacent to the chromitite layers and seams.
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