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education so that students can advance their learning in core academic subjects. ... (1996). Washington, D.C.: National
The author's colleague, K. Cielecki, excavating an ice sample from a shaft in the middle of an ice cliff at Jatunjampa G
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hundred million years, living from the Early Cambrian (beginning 542 million years ago) to the late Ordovician Period (which ended 443 million years ago).
Cambrian Cannibals Agnostid Trilobites and The Earliest Known Case of Arthropod Cannibalism by Mark A. S. McMenamin
Association between two Agnostid trilobites, Peronopsis interstricta, showing a larger Agnostid overiding a smaller one.
A slab from the Middle Cambrian Wheeler Formation, from Millard County, Utah
A
gnostid trilobites are tiny compared to their better known and larger relatives from the Paleozoic seas. Agnostids survived for almost exactly one hundred million years, living from the Early Cambrian (beginning 542 million years ago) to the late Ordovician Period (which ended 443 million years ago). Largely due to their diminutive size, agnostid trilobites have defied attempts to properly interpret their affinities, environmental preferences, behavior, and feeding strategies (McMenamin 2010). Results from a suite of 44 separate slabs bearing specimens of Peronopsis in21st CENTURY Spring-Summer 2012 67
Trilobite associations Total sample number:
44
Total number of large (>4 mm) intact trilobites: 44 Total number of small (4 mm in length) and small (
