This petrofabric contains fine grained moderate to coarse sand sized shales (ARFs), which occurred rarely to moderately in the samples. They are most commonly highly rounded, but sometimes elongate. They often contain coarse silt sized quartz and sometimes carbonates and Fe-Ti oxide phases. They are most commonly iron rich, but contain variable amounts. An iron content of 5-10% is frequent A lesser fraction of non-iron bearing shales, probably composed of kaolinite, can be found in some samples. These fragments can be identified as they are white even in partially oxidized or reduced zones. Overall, these shales are poorly compacted and poorly lithified, as further indicated by splitting that takes place along the long axis of many of...
This petrofabric contains fine grained moderate to coarse sand sized shales (ARFs), which occurred rarely to moderately in the samples. They are most commonly highly rounded, but sometimes elongate. They often contain coarse silt sized quartz and sometimes carbonates and Fe-Ti oxide phases. They are most commonly iron rich, but contain variable amounts. An iron content of 5-10% is frequent A lesser fraction of non-iron bearing shales, probably composed of kaolinite, can be found in some sa...
