Variedades de transición y más trabalenguas en el párrafo quingentésimo quincuagésimo séptimo de El Origen de las Especies

Si incomprensible era el final del párrafo anterior, incomprensible es asimismo éste párrafo entero:     557 It may be doubted whether the duration of any one great period of subsidence over the whole or part of the archipelago, together with a contemporaneous accumulation of sediment, would EXCEED the average duration of the same specific forms; and these contingencies are indispensable for the preservation of all the transitional gradations between any two or more species. If such gradations were not…