Die meisten Besucher waren damit beschäftigt, den herumliegenden Schutt zu untersuchen, aber Malcolm und ich waren mehr daran interessiert, eine gewisse aufgeschlossene Schicht im Anstehenden der Grube zu untersuchen.
Diese Bank relativ harten, kalkigen Tonsteins liegt zwischen weicheren Tonlagen und heißt Smoke Creek Trilobite Bed.
Dieser Horizont enthält eine Anreicherung von Trilobiten und ist Teil des Windom Shale Member der Moscow-Formation, die wiederum ins Givetium, Mittel-Devon zu stellen ist.
www.steinkern.deMost of the visitors were busy digging through the scree, but Malcolm and I were more interested in tackling a particular layer which lies exposed at the top of the pit.
This block row of relatively hard and limey mudstone lies between layers of soft shale and is called the Smoke Creek Trilobite Bed.
This trilobite-rich horizon lies within the Windom Shale Member of the Moscow Formation, which in turn belongs to the Givet stage of the Middle Devonian period.
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