One way to test things we didn't get to see, is to make predictions about what evidence must exist if those things were true. Here's an example, from a YE creationist, about Darwin's predictions:
Evidences for Darwin’s second expectation — of stratomorphic intermediate species —include such species as Baragwanathia (between rhyniophytes and lycopods), Pikaia (between echinoderms and chordates), Purgatorius (between the tree shrews and the primates), and Proconsul30(between the non-hominoid primates and the hominoids). Darwin’s third expectation — of higher-taxon stratomorphic intermediates — has been confirmed by such examples as the mammal-like reptile groups between the reptiles and the mammals, and the phenacodontids between the horses and their presumed ancestors. Darwin’s fourth expectation — of stratomorphic series — has been confirmed by such examples as the early bird series, the tetrapod series, the whale series, the various mammal series of the Cenozoic (for example, the horse series, the camel series, the elephant series, the pig series,the titanothereseries, etc.), the Cantius and Plesiadapus primateseries, and the hominid series. Evidence for not just one but for all three of the species level andabove types of stratomorphic intermediates expected bymacroevolutionary theory is surely strong evidence for
macroevolutionary theory. Creationists therefore need to accept this fact. It certainly CANNOT be said that traditional creation theory expected (predicted)any of these fossil finds.
YE creationist Dr. Kurt Wise Toward a Creationist Understanding of Transitional Forms