Time's Arrow, Time's Cycle

Gould ranks the development of the concept "deep time," which involved deliberately rejecting the biblical description of earth's past for nearly incomprehensible eons, with the revolutions associated with Copernicus and Charles Darwin.

A century later, Hutton heroically broke with this biblical zealotry by arguing that geological evidence must rest upon a solid empirical foundation.

So it was not until Charles Lyell published the Principles of Geology that geologists finally came to accept Hutton's basic message and banished miraculous intervention, catastrophes, and biblical deluges from their science.

[1][2] Having elaborated this bit of scientific melodrama, Gould proceeds to demolish it by showing that the actualities of Hutton's and Lyell's work were the opposite of the textbook legend.

Along with Kuhn and other philosophers and sociologists of science, Gould has recognized that mental constructs (metaphors, analogies, personal philosophies, imaginative leaps)—not empirical discoveries—are what bring about scientific advance.

[1] In contrast to textbook legend, Burnet was adamant about explaining the Biblical history of the earth entirely within the frame of natural science, devoid of all appeals to miracles or divine intervention.

[2] Hutton's theory of the earth as a geological clockwork of eroding continents balanced against uplifting ocean basins was not based on field observations but on a priori conceptions inspired jointly by religious considerations and "the most rigid and uncompromising version of time's cycle ever developed by a geologist.

[2] So rigid was Hutton's vision of an endlessly cycling earth having "no vestige of a beginning" and "no prospect of an end" that he lost all interest in the historical nature of geological change.

Subsequently, Charles Lyell, who needed an empiricist hero for his own account of the warfare between science and religious bigotry, bolstered Hutton's image as a fieldworker who had no conceptual bias.

[2] When pleading for his favorite client, which became known as the "uniformitarian" theory of geology, he portrayed the previous history of his discipline as a gradual overcoming of primitive superstitions, wild speculations, and biblical allegiances.

Rather he foisted upon his contemporaries a "fascinating and particular theory rooted in…time's cycle" by conflating a number of distinct elements under the single banner of "uniformitarianism," the regularity of physical laws with the irregularity of history.

It led him to deny all evidence of progression in the fossil record and hence to reject not only Lamarck's theory of evolution but also contemporary catastrophist notions, in which "higher" organisms were thought to replace "lower" ones after mass extinctions.

His gradualist reading of the geological record therefore required his constant "interpretation" of the recalcitrant evidence in order to reconcile it with his notions of time's stately cycle and a world without abrupt changes.

The literal fossil evidence of major rapid changes in previous faunas does not need to be interpreted away, as Lyell tried to do by appealing to the imperfection of the geological record.

[1] Gould sees supreme irony in the recent hypothesis of the Berkeley scientists Luis and Walter Alvarez that mass extinctions were caused by asteroidal or cometary impacts (a hypothesis now made plausible by the discovery of a worldwide iridium layer deposited at the Cretaceous-Tertiary boundary); for this is precisely the sort of wild "cosmological" speculation that Lyell derided in seventeenth-century writers like William Whiston.