1592953033000 1312632483000 term-28854 1616541501642 1312632519000 1616290452777 adlib fitz-online adlib-term-28854 cfac6dd5-43a1-3b77-ad3c-28a0a6288b4b 2 1 argon-potassium dating argon-potassium dating term reference term-28860 adlib-term-28860 8ce06cde-1ceb-39a1-8b7a-7e0c6042598b potassium-argon dating