A well-preserved fruit that may represent an extinct angiosperm of the Family Icacinaceae, or a precursor of the family, has been found in the Ono formation of northern California associated with marine invertebrates of Hauterivian age. This section has earlier yielded a small transported flora consisting of an angiosperm of doubtful affinity, together with typically Neocomian conifers, ferns, and cycadophytes that appear to have characterized the vegetation of the adjacent shore area.
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Chandler et al. (1961) studied this question.