[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Reference works](https://indike.org/pramana/ins.reference) › [An Encyclopaedia of Indian Archaeology](https://indike.org/pramana/ins.reference.ghosh-1989) › v1.c10.s3.1 # An Encyclopaedia of Indian Archaeology v1.c10.s3.1 An Encyclopaedia of Indian Archaeology v1.c10.s3.1 - **Language:** English ### [v1.c10.s3.1](https://indike.org/pramana/ins.reference.ghosh-1989.v1.c10.s3.1) Radiocarbon dating method assumes that the ¹⁴C/¹²C ratio has remained constant as the ¹⁴C production rate has not changed in the last million years. But tree-rings of sequoia and bristlecone pine, which live for thousands of years, when ¹⁴C-dated, show a discrepancy between the ¹⁴C dates and the dendrochronological dates: the ¹⁴C dates are progressively younger than the dendrochronological dates as one moves back in time. This fact goes against the assumption of the constancy of ¹⁴C/¹²C ratio. Or are there other explanations? The problem has been hotly debated several times, yet there is unanimity neither on the causes nor on the magnitude of variations so far. Below are discussed the various suggested corrections and mechanisms and their effect on Indian chronology. - [Previous: v1.c10.s2.4](https://indike.org/pramana/ins.reference.ghosh-1989.v1.c10.s2.4) - [Next: v1.c10.s3.2](https://indike.org/pramana/ins.reference.ghosh-1989.v1.c10.s3.2) - [Up: v1.c10.s3](https://indike.org/pramana/ins.reference.ghosh-1989.v1.c10.s3) --- Source: [https://indike.org/pramana/ins.reference.ghosh-1989.v1.c10.s3.1](https://indike.org/pramana/ins.reference.ghosh-1989.v1.c10.s3.1) · Pramāṇa