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Deep time is the concept of geologic time. The modern philosophical concept was developed in the 18th century by Scottish geologist James Hutton (1726–1797). Modern science has since established, after a long and complex history of developments, that the age of the Earth is around 4.54 billion years. ==Scientific concept== Hutton based his view of deep time on a form of geochemistry that had been developed in Scotland and Scandinavia from the 1750s onward. An understanding of geologic history and the concomitant history of life requires a comprehension of time which initially may be disconcerting. As mathematician John Playfair, one of Hutton's friends and colleagues in the Scottish Enlightenment, later remarked upon seeing the strata of the angular unconformity at Siccar Point with Hutton and James Hall in June 1788, "the mind seemed to grow giddy by looking so far into the abyss of time". Early geologists such as Nicolas Steno and Horace-Bénédict de Saussure developed ideas of geological strata forming from water through chemical processes, which Abraham Gottlob Werner (1749–1817) developed into a theory known as Neptunism, envisaging the slow crystallisation of minerals in the ancient oceans of the Earth to form rock. Hutton's innovative 1785 theory, based on Plutonism, visualised an endless cyclical process of rocks forming under the sea, being uplifted and tilted, then eroded to form new strata under the sea. In 1788 the sight of Hutton's Unconformity at Siccar Point convinced Playfair and Hall of this extremely slow cycle, and in that same year Hutton memorably wrote "we find no vestige of a beginning, no prospect of an end". Other scientists such as Georges Cuvier put forward ideas of past ages, and geologists such as Adam Sedgwick incorporated Werner's ideas into concepts of catastrophism; Sedgwick inspired his university student Charles Darwin to exclaim "What a capital hand is Sedgewick for drawing large cheques upon the Bank of Time!". In a competing theory, Charles Lyell in his ''Principles of Geology'' (1830–1833) developed Hutton's comprehension of endless deep time as a crucial scientific concept into uniformitarianism. As a young naturalist and geological theorist, Darwin studied the successive volumes of Lyell's book exhaustively during the ''Beagle'' survey voyage in the 1830s, before beginning to theorise about evolution. Physicist Gregory Benford addresses the concept in ''Deep Time: How Humanity Communicates Across Millennia'' (1999), as does paleontologist and ''Nature'' editor Henry Gee in ''In Search of Deep Time: Beyond the Fossil Record to a New History of Life'' (2001) Stephen Jay Gould's ''Time's Arrow, Time's Cycle'' (1987) also deals in large part with the evolution of the concept. John McPhee discussed "deep time" at length with the layman in mind in ''Basin and Range'' (1981), parts of which originally appeared in ''The New Yorker'' magazine. In ''Time's Arrow, Time's Cycle'' Gould cited one of the metaphors McPhee used in explaining the concept of deep time: Consider the Earth's history as the old measure of the English yard, the distance from the King's nose to the tip of his outstretched hand. One stroke of a nail file on his middle finger erases human history. Concepts similar to geologic time were recognized in the 11th century by the Persian geologist and polymath, Avicenna (Ibn Sina, 973–1037), and by the Chinese naturalist and polymath Shen Kuo (1031–1095). The Roman Catholic theologian Thomas Berry (1914–2009) explored the spiritual implications of the concept of Deep Time. Berry proposes that a deep understanding of the history and functioning of the evolving universe is a necessary inspiration and guide for our own effective functioning as individuals and as a species. This view has greatly influenced the development of deep ecology and ecophilosophy. The experiential nature of the experience of deep time has also greatly influenced the work of Joanna Macy and John Seed. H.G. Wells and Julian Huxley regarded the difficulties of coping with the concept of deep time as exaggerated:
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