Dinosaur egg-bearing deposits (Upper Cretaceous) of Boseong, Korea: occurrence, palaeoenvironments, taphonomy, and preservation
Dinosaur egg-bearing deposits (Upper Cretaceous) of Boseong, Korea: occurrence, palaeoenvironments, taphonomy, and preservation
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DOI：
10.1016/j.palaeo.2003.12.007
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发表时间：
2004-03
期刊：
影响因子：
--
通讯作者：
I. Paik;M. Huh;Hyun Joo Kim
中科院分区：
文献类型：
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作者：
I. Paik;M. Huh;Hyun Joo Kim
对韩国宝城上白垩纪仙苏砾岩中的恐龙（蜥脚类和鸟脚类）产卵沉积物进行了沉积学检查，以进行古环境和保存解释。恐龙蛋通常以一窝的形式保存，但也有孤立的蛋。至少在六个由砂质泥岩到泥岩组成的层位中发现了这些矿藏。这些地层被解释为终端扇沉积物。恐龙蛋沉积物中存在碎屑颗粒周围的方解石边缘和方解石光环、管状至结节状方解石以及颗粒周围至结节状裂纹。这些特征表明钙质成土作用似乎有助于卵的保存。在一处卵沉积物中，大多数发现了卵，出现了垂直特征，包括成土光滑面、假背斜和充满方解石的深层干燥裂缝。这些恐龙蛋保存在钙质和垂直古土壤中表明，筑巢地区的古气候是半干旱的。蛋和蛋壳没有移动，在洪水沉积物下方 5-10 厘米处存在一些蛋窝，以及蛋壳的多孔性质，表明这些蛋产在孵化过程中被掩埋的挖掘巢中。宝城多个地层中保存的大量恐龙巢穴与遗址保真度一致。
Dinosaur (sauropod and ornithopod) egg-bearing deposits of the Upper Cretaceous Seonso Conglomerate, Boseong, Korea were examined sedimentologically for palaeoenvironmental and preservational interpretation. Dinosaur eggs are commonly preserved as clutches, although isolated eggs also occur. The clutches are found in at least six horizons consisting of sandy mudstones to mudstones. These strata are interpreted as terminal fan deposits. Calcite rims and calcite aureols around detrital grains, pedotubular to nodular calcretes, and circumgranular to circumnodular cracks are present in the dinosaur egg deposits. These features indicate calcareous pedogenesis which appears to have assisted in the preservation of the eggs. In one egg deposit, in which clutches are mostly found, vertic features including pedogenic slickensides, pseudoanticlines, and calcite-filled deep desiccation cracks occur. The preservation of these dinosaur eggs in calcic and vertic palaeosols suggests that the palaeoclimate of the nested area was semiarid. The lack of displacement of eggs and egg shells, the presence of some egg clutches 5–10 cm below flood deposits, and the porous nature of the eggshells suggest that the eggs were laid in excavated nests that were buried during incubation. The preservation of numerous dinosaur clutches in several horizons at Boseong is consistent with site fidelity.