Abstract
SUMMARY Gyrochorte burrows are described for the first time from the Scarborough Formation (Middle Jurassic) of Yorkshire. The burrow consists of a low, winding, bilobate ridge with a paired braided structure and median furrow on the upper surface. It is considered to be the feeding trace of an organism whose body was inclined at an angle to the sediment–water interface. The Gyrochorte burrows are preserved in sandstones exhibiting current ripples and bidirectional “herringbone” cross-bedding, interpreted to have been deposited under high-energy, shallow water, tidal conditions of a coastal beach or barrier island facies. The absence of bioturbation in the Gyrochorte -bearing sandstones is in marked contrast to the burrow-mottling in the underlying sandstones and suggests that the Gyrochorte organism was an opportunistic animal ideally suited to exploiting highly mobile substrates.
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