R/fossil.R

#' Strontium content of fossils
#'
#' Strontium content of fossils from the mid-Cretaceous period.
#'
#' @docType data
#'
#' @usage data(fossil)
#'
#' @format A data frame with 2 columns and 106 rows. The columns are:
#' \itemize{
#' \item{age}{ in millions of years.}
#' \item{sr}{ strontium ratio.}}
#'
#' @details The ratio of strontium isotopes found in fossil shells in the mid-Cretaceous
#' period from about 90 to 125 million years ago. 
#'
#' @keywords datasets
#'
#' @source Bralower, T., P. Fullagar, C. Paull, G. Dwyer, and R. Leckie (1997). Mid-cretaceous strontium-
#' isotope stratigraphy of deep-sea sections. Geological Society of America Bulletin 109(11), 1421–1442.
#'
#' @references Chaudhuri, P. and J. S. Marron (1999). Sizer for exploration of structures in curves.
#' Journal of the American Statistical Association 94 (447), 807–823.
#'
#' @examples
#' data(fossil)
#'
"fossil"
julianfaraway/brinla documentation built on April 6, 2023, 2:33 p.m.