Slide #44
Microscope Magnification : 40X
Approximated Field Width : 2.5mm
Plane Polarized Light 1753.5 V This is the cherty region - note segregations of hydrocarbon occurrence. Could this be a feature of hydrocarbon movement along a water front? This is listed as cherty. Note that abundant hydrocarbons give a distinct reddish-brown color to section.
Depth: 1754.5
Slide #46
Microscope Magnification : 40X
Approximated Field Width : 2.5mm
PPL 1754.5H Cut parallel to bedding, with a "Honeycomb" structure from hydrocarbons. This section is listed as silty, and the difference in hydrocarbon occurrence and abundance is obvious. Compare this to slide #50 from 1757.5, with obvious hydrocarbon fractures.
Slide #47
Microscope Magnification : 100X
Approximated Field Width : 1mm
1754.5 V Plane Polarized Transmitted Light shows variations in structure on small scale: note segregation of hydrocarbons along the fracture.
Slide #48
Microscope Magnification : 100X
Approximated Field Width : 1mm
1754.5 V Cross Polarized Transmitted Light. Replacement of fossils suggests a change in fluid composition (An obvious that fluids are moving through the rock). Is it silicified or carbonate? (poss. some silica replacement of fossils).
Depth: 1756.5
Slide #49
Microscope Magnification : 100X
Approximated Field Width : 1mm
1756.5 V Plane Polarized Light of yellowish (lighter) pods, with darker undulating structures. Seems cherty under crossed polars ( Very dark field) but there seems to be preferential segregation of the hydrocarbons. Do the hydrocarbons occur here because of compositional variations of this scale, or is it just a primary depositional feature?.
Depth: 1757.5
Slide #51
Microscope Magnification : 40X
Approximated Field Width : 2.5mm
1757.5 H Plane Polarized Light. Cherty region; the core fractures into angular rubble.
Note -hydrocarbon accumulation again along fracture.
