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In a review for Science , Joel Hedgpeth summarizes the thesis of the " elegantly printed two-volume opus " as follows : Oblivious to continental drift ( not a commonly-accepted theory at the time ) , Heribert-Nilsson invokes tremendous tsunami s for the fact that many fossil floras , such as that of the London Clay , consist of species whose modern relatives live in tropical countries far removed from the site of deposition , as G. Ledyard Stebbins writes in an article for The Quarterly Review of Biology in 1955 .
 person: Joel Hedgpeth; person: Heribert-Nilsson; person: G. Ledyard Stebbins
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Joel Hedgpeth; person: Heribert-Nilsson; person: G. Ledyard Stebbins