To verify the usefulness of calcite U–Pb measurement for vertebrate‐bearing strata in the Eastern Gobi, Mongolia, we performed laser ablation‐inductively coupled plasma‐mass spectrometry calcite U–Pb and trace element analyses of three caliche (calcrete) of the Bayn Shire Formation. The trace element analysis demonstrates high concentration of U in the calcites. Two meaningful calcite U–Pb ages were obtained; 95.9 ± 6.0 and 89.6 ± 4.0 Ma, which are consistent with published ages from the Bayn Shire Formation. Our results demonstrate that the calcite U–Pb method can be powerful tool for age determination of vertebrate‐bearing strata in the Gobi that do not contain index fossils or beds, but do contain caliches. This would make it possible for a comparison of biostratigraphy between the Gobi and other areas yielding abundant vertebrate fossils in Asia, North America and Europe, based on chronological data.

中文翻译：

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蒙古东部戈壁沙漠白垩纪含脊椎动物Bayn Shire组的方解石U–Pb年龄：降钙剂对确定年龄的有用性

为了验证方解石U–Pb测量对蒙古东部戈壁的脊椎动物地层的有用性，我们进行了激光烧蚀-电感耦合等离子体质谱法方解石U–Pb以及对拜恩州三个钙（钙）石的微量元素分析夏尔组。微量元素分析表明方解石中U含量高。获得了两个有意义的方解石U–Pb年龄；95.9±6.0和89.6±4.0 Ma，与Bayn Shire组的公布年龄一致。我们的结果表明，方解石U–Pb方法可以作为确定戈壁中含脊椎动物的地层的年龄的有力工具，这些地层中没有指示化石或层，但确实有凹陷。