Error in re-building vignettes:
  ...
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in predictExtrapUp(alpha, lambda, beta, predictPositionsRescaled[depthIndRange],  :
  Unable to find suitable chronologies for top of core - truncated to date of extraction
Warning in predictExtrapUp(alpha, lambda, beta, predictPositionsRescaled[depthIndRange],  :
  Unable to find suitable chronologies for top of core - truncated to date of extraction
Warning in predictExtrapUp(alpha, lambda, beta, predictPositionsRescaled[depthIndRange],  :
  Unable to find suitable chronologies for top of core - truncated to date of extraction
Warning in predictExtrapUp(alpha, lambda, beta, predictPositionsRescaled[depthIndRange],  :
  Unable to find suitable chronologies for top of core - truncated to date of extraction
Warning in predictExtrapUp(alpha, lambda, beta, predictPositionsRescaled[depthIndRange],  :
  Unable to find suitable chronologies for top of core - truncated to date of extraction
Warning in predictExtrapUp(alpha, lambda, beta, predictPositionsRescaled[depthIndRange],  :
  Unable to find suitable chronologies for top of core - truncated to date of extraction
Warning in predictExtrapUp(alpha, lambda, beta, predictPositionsRescaled[depthIndRange],  :
  Unable to find suitable chronologies for top of core - truncated to date of extraction
Warning in predictExtrapUp(alpha, lambda, beta, predictPositionsRescaled[depthIndRange],  :
  Unable to find suitable chronologies for top of core - truncated to date of extraction
Warning in predictExtrapUp(alpha, lambda, beta, predictPositionsRescaled[depthIndRange],  :
  Unable to find suitable chronologies for top of core - truncated to date of extraction
Warning in predictExtrapUp(alpha, lambda, beta, predictPositionsRescaled[depthIndRange],  :
  Unable to find suitable chronologies for top of core - truncated to date of extraction