Dendrochronology is an under-utilized tool for archaeological research in Northwest Mexico due to the frequency of IADFs and false rings. This project seeks to understand the appearances and causes of this phenomenon through charting these abnormalities in modern pine and looking for correlations. This investigation reveals useful insight to simplify the reading of Pinus in this region. A collection of ten sampled trees from the Malpaso Valley were used to make a chronology. I also compare the appearances of ring abnormalities with gridded precipitation values of the region to identify large-scale climate factors for false rings and IADFs. I demonstrate a relationship between resin duct position and false boundaries as well as a correlation with cambial age and abnormal ring formations. Comparison with precipitation reveals little correlation with the frequency, type, or location of these abnormalities. However, many of avenues are available to continue this investigation as discussed in this thesis.