Lack of oxygen slowed bacterial decomposition and kept the usual scavengers away, so leaves of palms, ferns and sycamores, some showing the insect damage they had sustained during their growth, were covered with fine-grained silt and preserved.
Lack of oxygen slowed bacterial decomposition. Lack of oxygen kept the usual scavengers away. Leaves of palms, ferns and sycamores were covered with fine. Leaves of palms, ferns and sycamores were grained silt. Leaves of palms, ferns and sycamores were preserved. Leaves of palms, ferns and sycamores were some. This was showing the insect damage. They had sustained during their growth the insect damage.