The data is about the counts of the frequency of occurrence of different kinds of fossil pollen grains and is available in Mosimann (1962).
data(fossil_pollen, package = "MLEce")A dataframe with 73 observations and 4 variables: pinus, abies, quercus and alnus pollens.
Mosimann, J. E. (1962) On the compound multinomial distribution, the multivariate beta distribution, and correlations among proportions. Biometrika, 49, 65-82.