Terrestrial vertebrate trace fossils are relatively abundant in mid-to-late Triassic and early Jurassic deposits in the British Isles but to date none at all have been recorded from the Rhaetian, the final stage of the Triassic. This represents a persistent gap in the terrestrial ichnological record. We present the first Rhaetian track to be recognised in the British Isles, found at Aust Cliff on the south bank of the Severn Estuary near Bristol in SW England. This locality is well known for disarticulated remains of Rhaetian fossil reptiles including some terrestrial species but in 2006 a track (TECMAG0161) was found for the fist time. Although the specimen was found ex-situ the palynological data from the surrounding matrix confirms a Rhaetian age. The track was examined with CT scanning and photogrammetry. We tentatively assign the track to the ichnogenus Procolophonichnium based on size and digit proportions. The isolated nature of the specimen offers little concrete information about the track maker but such tracks have previously been attributed to parareptiles or therapsid trackmakers. The specimen adds a datapoint to an otherwise ichnologically empty period of time in the British Isles. The track also provides solid evidence for a [locally] terrestrial environment in a sequence that is otherwise considered predominantly marine or estuarine. This discovery suggests that there may be more such tetrapod tracks of Rhaetian age preserved, at least at Aust, and further searching will hopefully lead to the current minimal dataset being expanded.

在不列颠群岛的三叠纪中晚期和侏罗纪早期沉积物中，陆生脊椎动物的痕迹化石相对丰富，但迄今为止，三叠纪的最后阶段Rhaetian没有记录到任何化石。这代表了陆地鱼类学记录中的持续差距。我们介绍了在不列颠诸岛上公认的第一条雷塔伊轨道，发现于英格兰西南部布里斯托尔附近塞文河口南岸的奥斯特悬崖。这个地方以Rheatian化石爬行动物的残骸残骸（包括一些陆生物种）而闻名，但是在2006年的第一时间发现了一条轨道（TECMAG0161）。尽管标本是在异地发现的，但来自周围基质的孢粉学数据证实了它的年龄。用CT扫描和摄影测量法检查了轨道。根据大小和手指比例的前蛇菊烯。标本的孤立性质几乎没有提供有关跟踪器的具体信息，但以前已将此类跟踪归因于副爬行动物或治疗性跟踪器。该标本为不列颠群岛的一个物候学上空的时间段增加了一个数据点。轨道还为序列中的[本地]陆地环境提供了可靠的证据，否则该序列通常被认为是海洋或河口。这一发现表明，至少在奥斯特，可能会保留更多这样的Rhaetian年龄的四足动物径迹，进一步的搜索有望导致当前的最小数据集得到扩展。