Officer	start	end	year	48	49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64	65	66	67	68	69	70	71	72	73	74	75	76	77	78	79	80	81	82	83	84	85	86	87	88	89	90	91	92	93	94	95	96	97	98	99	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29
William	Theobald	1848	1881		0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33
Jos. G	Medlicott	1851	1862					0	1	2	3	4	5	6	7	8	9	10
Thomas	Oldham	1851	1876					0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25
Henry Benedict	Medlicott	1854	1887	d.1907 R.Soc							0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33
Henry Francis	Blanford	1855	1861									0	1	2	3	4	5	6
William Thomas	Blanford	1855	1882									0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27
William	King	1857	1894											0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37
Robert Bruce	Foote	1858	1891												0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33
Frederick R.	Mallet	1859	1889													0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Francis	Fedden	1860	1887														0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27
Ferdinand	Stoliczka	1862	1874																0	1	2	3	4	5	6	7	8	9	10	11	12
Theodore W.	Hughes	1862	1894																0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32
Arthur Beavor	Wynne	1862	1883																0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21
Valentine	Ball	1864	1881																		0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17
William	Waagen	1870	1875																								0	1	2	3	4	5
Richard	Lydecker	1874	1883																												0	1	2	3	4	5	6	7	8	9
Carl Ludovic .	Griesbach	1878	1903	d.1907																															0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25
Richard Dixon	Oldham	1879	1904	d1936																																0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25
Pramatha Nath	Bose	1880	1903																																		0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Thomas H Digges	LaTouche	1881	1910	d.1938																																		0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29
Charles Stewart	Middlemiss	1883	1917	22Nov 1859 -11 Jun 1945																																				0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34
Edward James	Jones,	1883	1889																																					0	1	2	3	4	5	6
Fritz	Noetling	1886	1903																																								0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17
Philip	Lake	1887	1891																																									0	1	2	3	4
Parvati Nath	Datta	1888	1913																																										0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25
Heinrich	Warth	1890	1896																																												0	1	2	3	4	5	6
Thomas Henry	Holland	1890	1910	d1947																																											0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
Frederick Herbert	Smith	1892	1904																																														0	1	2	3	4	5	6	7	8	9	10	11	12
Ernest (Watson)	Vredenburg	1895	1923																																																	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28
George E	Grimes	1895	1898																																																	0	1	2	3
Henry Hubert	Hayden	1895	1921	d1923																																																0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	Hayden
Thomas leonard	Walker	1897	1901																																																			0	1	2	3	4
Albrecht von KrafIt	Delmensingen,	1899	1901	d1901																																																				0	1	2
Frederick Henry	Hatch	1899	1901																																																					0	1	2
George F	Reader	1899	1901																																																					0	1	2
R R	Simpson	1901	1906																																																							0	1	2	3	4	5
Guy Ellcock	Pilgrim	1902	1930	1875-1943 (Fermor)																																																							0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27
Lewis Leigh	Fermor	1902		b. 1880 d. 1957																																																							0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27
George Howlett	Tipper	1903	1929																																																									0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26
Sir Edwin Hall	Pascoe	1905	1932																																																											0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24
Derald de Purcell	Cotter	1905																																																												0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24
John Coggin	Brown	1905																																																												0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24
Alexander Macmillan	Heron	1906																																																													0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Murray	Stuart	1907	1921																																																													0	1	2	3	4	5	6	7	8	9	10	11	12	13
Cyril S.	Fox	1911																																																																		0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
Darashaw Nowsherwan	Wadia,	1921		23Oct1883-15 June 1969 (Auden)																																																																										0	1	2	3	4	5	6	7	8
John Alexander	Dunn	1921																																																																												0	1	2	3	4	5	6	7	8
Number of Active Geologists each year					1	1	1	3	3	3	4	6	6	7	8	9	10	10	11	11	12	12	12	12	12	12	13	13	13	13	14	13	12	11	12	13	14	15	13	14	12	12	13	14	13	13	13	13	12	12	12	13	13	13	13	15	15	16	14	15	12	13	14	14	14	14	14	13	13	13	12	12	12	12	11	11	11	11	11	11	10	10	10	10	10	10