15. The method of claim 7 further comprising: establishing one or more intermediate nodes; and where coupling the root nodes to the leaf nodes to enable the Bayesian network to predict sand-grain composition and texture comprises: coupling at least some of the one or more root nodes to at least some of the one or more leaf nodes through the one or more intermediate nodes.
15. The method of claim 7 further comprising: establishing one or more intermediate nodes; and where coupling the root nodes to the leaf nodes to enable the Bayesian network to predict sand-grain composition and texture comprises: coupling at least some of the one or more root nodes to at least some of the one or more leaf nodes through the one or more intermediate nodes. 16. The method of claim 15 where coupling the root nodes to the leaf nodes to enable the Bayesian network to predict sand-grain composition and texture comprises: coupling the root nodes to the leaf nodes in causal relationships that honor observations of natural systems.