Editing List of geologists (section)

==D==
<!-- Please note, this is not intended to be a list of every geologist with a wiki page. Please limit additions to famous or especially notable geologists. Thank you!-->

[[Image:Charles Darwin aged 51.jpg|thumb|upright|[[Charles Darwin]], c.1860]]
[[File:Ljudmila Dolar Mantuani.jpg|thumb|upright|[[Ljudmila Dolar Mantuani]] (1906–1988) first female professor of petrography in Yugoslavia]]
* [[Brent Dalrymple|G. Brent Dalrymple]] (born 1937), United States, author ''[[The Age of the Earth]]'' (1991), winner National Science Medal, 2005
* [[James Dwight Dana]] (1813–1895), American, author of ''System of Mineralogy'' (1837)
* [[Charles Darwin]] (1809–1882), British naturalist, author of ''[[On the Origin of Species]]'', [[atoll]] formation
* [[George Mercer Dawson]] (1849–1901), Canadian, pioneer [[Yukon]] geologist, [[Fellow of the Royal Society]]
* [[John William Dawson]] (1820–1899), Canadian, pioneer [[Acadian]] geologist, [[Fellow of the Royal Society]]
* [[Henry De la Beche]] (1796–1855), English, first director of the [[Geological Survey of Great Britain]]
* [[Duncan R. Derry]] (1906–1987), Canadian [[Economic geology|economic geologist]], awarded [[Logan Medal]]
* [[Nicolas Desmarest]] (1725–1815), French, pioneer [[volcanologist]]
* [[Thomas Dibblee]] (1911–2004), American, geological mapper and pioneer of [[San Andreas Fault]] movement study
* [[William R. Dickinson]] (1930–2015), Arizona, American, [[plate tectonics]], [[Colorado Plateau]]; Member of [[National Academy of Sciences]]
* [[Robert S. Dietz]] (1914–1995), American, [[seafloor spreading]] pioneer, awarded [[Penrose Medal]]
* [[Déodat de Dolomieu]] (1750–1801), French geologist
*[[Ljudmila Dolar Mantuani]] (1906–1988), Slovenian [[Petrology|petrologist]], first female professor of petrography in Yugoslavia 
* [[Louis de Loczy]] (1897–1980), Hungarian-Brazilian geologist
* [[Ignacy Domeyko]] (1802–1889), Slavic-Chilean [[geologist]] and [[mineralogist]], namesake of the mineral [[domeykite]]
* [[R. J. W. Douglas|Robert John Wilson Douglas]] (1920–1979), Canadian [[petroleum geologist]], Fellow of the [[Royal Society of Canada]]
* [[Aleksis Dreimanis]] (1914–2011), [[Latvian Canadians|Latvian-Canadian]] award-winning [[Quaternary]] geologist, Fellow of the [[Royal Society of Canada]]
* [[Hugo Dummett]] (1940–2002), South African mineral-exploration geologist, co-discoverer of [[Ekati Diamond Mine]]
* [[Alexander du Toit]] (1878–1948), South African geologist, established correlations between Argentina, Paraguay, Brazil and South Africa
* [[Clarence Edward Dutton]] (1841–1912), American, author of ''Tertiary History of the Grand Canyon District''