Clinker is found near deformed zones such as faults or tight folds, and is older than the deformities themselves.
2.
The knot is usually tied around a small weight, such as a stone, marble, tight fold of paper, grapeshot, or a piece of wood.
3.
During subduction-160 to 80 million years ago-and the subsequent uplift, the terrane was twisted, broken and disrupted, and the chert was deformed into the tight folds now visible in road cuts along O'Shaughnessy Boulevard ( see photo ).