Here, we present the detrital zircon age spectra for five (n = 36, 68, 66, 41, 29) red quartzite gastroliths collected from the top of the Upper Jurassic Morrison Formation in the eastern Bighorn Basin, Wyoming, USA. The detrital zircon age spectra reveal geon 17 maximum depositional ages, and age peaks that are Yavapai (geon 17), Penokean (geon 18) and Archean (>geon 25). The colour, texture, composition and zircon age spectra of these exoliths are indistinguishable from those of geon 16 (i.e. Baraboo interval) quartzites present in the Laurentian midcontinent more than 1,000 km to the east. We interpret that these gastroliths were ingested by dinosaurs, most likely sauropods, in the Laurentian midcontinent and then transported in their digestive tracts to the site of deposition. These data support the hypothesis of long-distance dinosaur migration, perhaps following low energy, continental-scale drainage systems that flowed from the Appalachian highlands to the Morrison Formation depositional basin.

中文翻译：

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移动中的侏罗纪恐龙：腹石起源和长途迁徙

在这里，我们展示了五个 ( n = 36, 68, 66, 41, 29) 从美国怀俄明州比格霍恩盆地东部的上侏罗统莫里森组顶部收集的红色石英岩胃石。碎屑锆石年龄谱揭示了geon 17的最大沉积年龄，以及Yavapai（geon 17）、Penokean（geon 18）和太古代（>geon 25）的年龄峰值。这些系外岩石的颜色、质地、成分和锆石年龄光谱与东部 1,000 多公里的劳伦中部大陆中存在的 geon 16（即 Baraboo 间隔）石英岩的颜色、质地、成分和锆石年龄光谱无法区分。我们解释说，这些胃石被劳伦中大陆的恐龙（很可能是蜥脚类恐龙）吞食，然后通过消化道运送到沉积地点。这些数据支持恐龙长距离迁徙的假设，可能是因为能量低，