SEM photo at 500X. Backscattered electron Image (BEI) shows epoxy and hydrocarbon-filled pores as black.
SEM photo at 500X. Secondary electron image (SEI) shows open porosity outlined by the bright white charging pore edges. The large detrital grains are feldspar, the matrix is silica, and the small white circles are framboidal pyrite.
SEM photo at 750X. This backscattered electron image shows a detrital feldspar grain in a state of disequilibrium. Originally potassium feldspar, we can see darker patches of albite replacing the feldspar. Pyrite framboids (white) and calcite tests (light gray) are in a silica matrix.
SEM photo at 250X. Backscattered electron image shows white pyrite framboids, light gray carbonate tests, a 100m silica microfossil, silica matrix, and black hydrocarbon.
SEM photo at 750X. Backscattered electron image shows white pyrite framboids, light gray carbonate tests, a 100m silica microfossil, silica matrix, and black hydrocarbon. The large dark gray grain above the microfossil is detrital plagioclase (the calcium component makes it brighter than silica).
SEM Photo at lOOOX. This backscattered electron image shows a pyritized fossil, dark gray silica matrix, detrital plagioclase and potassium feldspar grains, and curved carbonate tests (dark gray). The striated gray material in the fossil chambers is gypsum. Some fractures in this specimen also were gypsum filled. Alternating reducing and oxidizing fluids must have permeated this specimen to produce both sulfur-bearing phases.
