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辽西北票市四合屯及其周边地区赋存长毛恐龙及早期鸟类化石的地层时代, 存在晚侏罗世、早白垩世和晚侏罗~早白垩世多种观点. 近年发表的同位素年龄数据也存在较大分岐. 四合屯含脊椎动物化石层位的凝灰岩中锆石U-Pb法定年结果为(125.2±0.9) Ma, 锆石强的抗热扰动性及高的U-Pb体系封闭温度, 决定了这一年龄值更客观地反映出四合屯脊椎动物生存时代为早白垩世.
There are many views of Late Jurassic, Early Cretaceous and Late Jurassic ~ Early Cretaceous in the stratigraphic era of Sihetun and its surrounding areas where the hairy dinosaurs and early bird fossils are hosted. Age data also have a big difference.The zircon U-Pb dating of tuffs in the Sihetun vertebrate fossil layer is (125.2 ± 0.9) Ma, the strong thermal perturbation of zircon and high U-Pb The closure temperature of the system determines that this age value more objectively reflects that the age of survival of Sihetun vertebrates is Early Cretaceous.