地质研究表明，里海曾经是被称为副特提斯海的史前海洋的一部分。
Geological research indicates that the Caspian sea was once part of a prehistoric sea known as the Paratethys.
例如，他提到一篇科学论文中言及苔藓，细菌和其他类似的生物可能是史前地质情况和陆地形成的推动力。
For example, he mentions a scientific paper that suggests that lichens, bacteria and the like may have been a driving force behind prehistoric geology and the formation of continents.
这种史前的地质奇观经过数世纪的雨袭和侵蚀而成。
These prehistoric geologic wonders known as slot canyons have been craved by centuries of rain and erosion.
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