Detailed fieldstudies of thick rock formations containing fossils provide the best potential tests of the competing theories.
对含有化石的厚岩层的详细现场研究为相互竞争的理论提供了最佳的潜在检验。
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Recent fieldstudies, however, reveal that on dives in the wild, the seal usually heads directly for its prey and returns to the surface in less than twenty minutes.