1. Geochronology: the study of time in relation to the history of the Earth.

2. His doctoral thesis was devoted to the geochemistry, geochronology and nuclear chemistry of the noble gases xenon and krypton.

3. Geochronology is the science of measuring ages, rates, and histories of geologic or planetary materials, and using these insights to understand processes and phenomena in earth and planetary science.

4. Development of geochronology from isotopic chronology to tectonic chronology must evolve several stages including ther- mal chronology, tectono-thermochronology and deformation chronology.

5. Paul Renne, director of the Berkeley Geochronology Center, which specializes in dating rocks, said the researchers made "a reasonably good argument" to support their dating of the fossils.

6. Geochronology is an important fundamental branch of modern geology, which was coming into being in the early 20 century and got rapid development in 1950s and 1960s.

7. According to isotopic geochronology, intrusion of Yunmengshan plutons happened in Middle Yanshanian.

8. This paper studied the geochronology of sandstone - type uranium deposit in the Dongsheng area of Ordos Basin.

9. As isotope geochronology uses the elements of long half-life to determine the geological age, the half-life through out the period may be considered to be constant.

10. The isotopic geochronology is an important way for researching the geologic development of these two groups.

11. The ophiolite geochronology is very important for the study of tectonic evolution of orogenic belt and the reconstruction of the ancient ocean-land and plate tectonic framework.

12. Zhang Y. (2002) Isotope geochronology and the age of the earth.

13. The results of systematic studies of geochronology, geochemistry and uranium metallogenic condition of volcanic rocks and granites in Guyuan-Duolun Basin are reported.

14. This paper presents a systematic study on morphology, geochemistry and geochronology of a zircon population from the Danzhu granodiorite located in the southwest region of the Zhejiang province.

15. This paper includes a systematic analysis and correlation study on the sporopollen assemblages, stratigraphic sequence and geochronology of the Zhuerzhuang Red Bed Sections in Yaone, Gansu.

16. The succession, division and correlation of these strata are studied with lithostratigraphy, biostratigraphy and isotopic geochronology methods and by the combination of of point, line and area.

17. The determination of the absolute age of rocks, minerals and fossils, in years before the present, is the basis for the field of geochronology.

18. The Herto samples were analyzed by Paul Renne of the Berkeley Geochronology Center and in Bill Hart's lab at Miami University. The results gave an age of 160, 000 to 154, 000 years for the skull.

19. This paper includes a systematic analysis and correlation study on the sporopollen assemblage, stratigraphic sequence and geochronology of the Siwangou red bed section in Yaojie, Gansu.

20. Up to now, the Earth's orbital parameters remain the only periodicities in geology subject to precise calculations and, therefore, may provide new scales for geochronology.