Gould recalls that "Eldredge's 1971 publication had presented the only new and interesting ideas on the paleontological implications of the subject—so I asked Schopf if we could present the paper jointly."
Gould lembra que a "publicación de Eldredge de 1971 presentara as únicas ideas novas e interesantes sobre as implicacións paleontolóxicas do asunto, así que pregunteille a Schopf se nós podiamos presentar o artigo conxuntamente."