Reproducing Tierney et al. Nature 2013

1. Goal: Showing how to leverage pylipd, GeoChronR and Pyleoclim to reproduce [Tierney et al. Nature 2013](https://www.nature.com/articles/nature11785). 
2. Description: Lots of cell magic
3. References/data sources:  [Tierney et al. Nature 2013](https://www.nature.com/articles/nature11785)
4. Keywords (science): MC-PCA, age modeling
5. Keywords (tech):
