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There are three chronologies here, but for whatever reason we've decided not to use any of them. We want to build a new one with the function `Bchronology()` from the [`Bchron` package](https://cran.r-project.org/web/packages/Bchron/vignettes/Bchron.html). First we want to see what chroncontrols we have for the prior chronologies. We're going to select the chronologies used for chronology `14591` as our template.
We can look at other tools to decided how we want to manage the chroncontrols, for example, saving them and editing them using Excel or another spreadsheet program. We could add a new date by adding a new row. In this example we're just going to modify the existing ages to provide better constraints at the core top. We are setting the core top to *0 calibrated years BP*, and assuming an uncertainty of 2 years, and a thickness of 1cm.
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