So sánh phương pháp

	Tephrochronology	Niên đại địa từ khảo cổ
Lĩnh vực	Khảo cổ học	Khảo cổ học
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1944	1968
Người khởi xướng	Sigurdur Thorarinsson	Robert Coe
Loại	Volcanic marker dating technique	Magnetic reference frame dating
Công trình gốc	Thorarinsson, S. (1944). Tefrokronologiska studier på Island. Geografiska Annaler, 26(1-2), 1-217.	Coe, R. S. (1968). The determination of paleointensities and neomagnetic effects on pottery. Journal of Geophysical Research, 73(12), 3247-3262.
Tên gọi khác	tephra chronology, volcanic ash dating	paleomagnetic dating, magnetic declination dating
Liên quan	4	3
Tóm tắt	Tephrochronology is a chronometric and stratigraphic technique that uses volcanic ash layers (tephra) as time markers to date and correlate archaeological and geological deposits. Pioneered by Icelandic geologist Sigurdur Thorarinsson in 1944, it exploits the fact that large explosive volcanic eruptions deposit distinctive ash layers across vast geographic regions instantaneously in geological time. Each tephra layer serves as a chronological marker horizon that can be identified, characterized, and dated, enabling archaeologists to synchronize deposits across multiple sites.	Archaeomagnetic dating uses changes in Earth's magnetic field intensity and direction recorded in fired clay artifacts to determine age. Pioneered by Robert Coe in the 1960s, the method measures the magnetization of pottery and baked clay features, comparing measurements to a master curve of geomagnetic variation through time. Archaeomagnetic dating is most effective for materials dated to the last 10,000 years and is particularly powerful in arid regions where clay artifacts are well-preserved.