11. Living organisms have well-adapted structures and materials over geological time through natural selection. 12. It has not erupted since 1859, only an instant in terms of geological time . 13. The museum also maintains a " Geological Time Clock ". 14. A number of magmatic features are present in the Circum-Superior Belt, including geological time span. 15. The geological time covered in part three explores the ages of the Earth and the Sun. 16. The galactic year provides a conveniently usable unit for depicting cosmic and geological time periods together. 17. This discovery pushes the date for their appearance back to the earliest part of geological time . 18. The Everglades were formed relatively recently, about 10, 000 years ago, an eye-blink in geological time . 19. The valley gives its name to the Hirnantian Age in the Ordovician Period of geological time . 20. Hardly, Wilson said : " On a geological time scale, ( exfoliation is ) fairly common.
