Title

The Curse of Rafinesquina: Negative Taphonomic Feedback Exerted by Strophomenid Shells on Storm-Buried Lingulids in the Cincinnatian (Katian, Ordovician) Series of Ohio

Document Type

Article

Publication Date

6-2013

Publication Source

Palaios

Volume

28

Issue

6

Inclusive pages

359-372

Peer Reviewed

yes

Abstract

Thousands of lingulid brachiopods were found clustered beneath hundreds of individual valves of the strophomenid brachiopod Rafinesquina in the Upper Ordovician of Ohio. This association suggested a relationship between the two brachiopods, but the nature of this relationship was unclear. We utilized serial thin sectioning to examine these brachiopods and to determine the origin of the bed in which they were found. Sedimentary structures, mixed taphonomies, and stratigraphic and paleogeographic setting suggest that the lingulids occupied a hiatal concentration that had previously been reworked, but not significantly transported, by tropical storms. The final burial event was a storm that exhumed living lingulids along with disarticulated Rafinesquina shells from the same sediments. Neither living nor dead shells were transported, but were reworked locally, then reburied together. The lingulids then burrowed upward to escape, but most were trapped by the concavedownward Rafinesquina shells that had been redeposited above them. This finding offers the first documented example of negative ecosystem engineering and taphonomic feedback in the fossil record, as well as the oldest documented lingulid escape traces. It also suggests that taphonomic feedback can be subdivided into live-dead interactions that occur under normal background depositional conditions and those that occur during periodic short-lived sediment-reworking events, such as storms and tsunamis.

Keywords

obrution, tempestite, fugichnia, ecosystem engineering, shell bed

Disciplines

Behavior and Ethology | Earth Sciences | Environmental Indicators and Impact Assessment | Evolution | Geology | Marine Biology | Paleobiology | Paleontology | Sedimentology | Terrestrial and Aquatic Ecology

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