1   Datus Ensign STUDLEY b: July 16, 1808 in NY   d: June 16, 1874 in Lapel, Madison Co., IN Burial: Woodward Gwinn, Madison Co., Indiana
..  +Ruth CASTOR b: November 30, 1806 in Beaver Co., PA  m: 1830 in Green Twp., Ashland Co., OH d: May 15, 1872 in Lapel, Madison Co., IN Burial: Woodward Gwinn, Madison Co., Indiana
..... 2   Rebecca STUDLEY b: 1831 in Green Twp., Ashland Co., Ohio   d: September 05, 1915 in Monroe Twp., Madison Co., IN
..... 2   Sanford STUDLEY b: September 24, 1831 in Green Twp., Ashland Co., Ohio   d: September 15, 1881 in Chetopa, Labette Co. KS
.........  +Sarah Ellen REDDICK b: April 13, 1838 in Morgantown, Morgan Co., IN  m: Abt. 1854 d: September 24, 1881 in Chetopa, Labette Co., KS
..... 2   Oliver STUDLEY b: 1834 in Ohio
.........  +Olive HUFFMAN b: Abt. 1835  m: Abt. 1855
..... 2   Calvin Wesley STUDLEY b: December 21, 1835 in Green Twp., Ashland Co., Ohio   d: May 05, 1916 in Chetopa, Labette Co., KS
.........  +Georgiana COLLINS b: Abt. 1842  m: March 11, 1866 in Fishersburg, Madison Co., IN
..... 2   Mary Lucinda STUDLEY b: July 18, 1837 in Green Twp., Ashland Co., Ohio   d: September 16, 1926 in Anderson, Madison Co., IN
.........  +John Alexander SEARS b: April 27, 1843 in Henry Co., In  m: August 12, 1866 in Madison Co., IN d: March 11, 1919 in Anderson, Madison Co., IN
..... 2   Martha Jane STUDLEY b: June 18, 1839 in Stony Creek Twp., Madison Co., IN   d: March 28, 1881 in Harlan Twp., Warren Co., OH Burial: Goshen Cemetery, Clermont Co., Ohio
.........  +Stephen Arnold ELSTEN b: March 1836 in Hamilton Twp., Warren Co., OH  m: Abt. 1859 in Madison Co., IN d: August 24, 1907 in Lapel, Madison Co., IN Burial: Lapel Brookside, Madison Co., Indiana
..... 2   Datus Ensign STUDLEY, Jr. b: August 31, 1841 in Fishersburg, Madison Co., Indiana   d: July 23, 1910 in Chicago, Cook Co., IL Burial: Oakridge Cemetery, Chicago, Cook Co.,  IL
.........  +Louisa R. SEARS b: September 07, 1845  m: October 04, 1866 in Madison Co., IN d: April 20, 1879 in Lapel, Madison Co., IN
.....  *2nd Wife of Datus Ensign STUDLEY, Jr.:
.........  +Annie M. NORRIS b: Abt. 1841  m: October 22, 1883 d: March 20, 1884
.....  *3rd Wife of Datus Ensign STUDLEY, Jr.:
.........  +Mollie E. FALLIS b: Abt. 1842  m: October 01, 1884 in Madison Co., IN
..... 2   Charles Conrad STUDLEY b: August 02, 1843 in Lapel, Madison Co., Indiana   d: November 09, 1919 in Lapel, Madison Co., Indiana Burial: Lapel Brookside, Madison Co., Indiana
.........  +Louise HANGER b: Abt. 1843  m: September 09, 1866 d: May 04, 1880
.....  *2nd Wife of Charles Conrad STUDLEY:
.........  +Matilda N. COTTRELL b: January 1848  m: February 19, 1882
..... 2   Margaret E. STUDLEY b: July 13, 1848 in Lapel, Madison Co., Indiana
.........  +John ALDEN b: Abt. 1848
..... 2   Cyrus D. STUDLEY b: July 13, 1848 in Lapel, Madison Co., Indiana   d: November 01, 1869 in Lapel, Madison Co., Indiana Burial: Woodward Gwinn, Madison Co., Indiana
..... 2   Joseph W. STUDLEY b: October 02, 1850 in Lapel, Madison Co., Indiana   d: July 25, 1923 in Marion, Grant Co., Indiana Burial: Lapel Brookside, Madison Co., Indiana
.........  +Lamira V. MILLBURN b: October 1857 in Madison Co., IN  m: June 17, 1875 in Fishersburg, Madison Co., IN d: June 17, 1936 Burial: Lapel Brookside, Madison Co., IN

1820 Bergen Twp., Genesee Co., NY*
Joseph Studley 26-45
Wife 26-45
son under 10
son 10-16 (Datus age 12)
3 daughters under 10
1 daughter 10-16

*Note:  Bergen Township, Genesee County, New York was formed in 1812 from Batavia Township. The first settlement in Bergen Village was by Samuel Lincoln from Connecticut in September 1805.  This is a possible clue to Datus' CT connection. His father lived in Tolland Town, Tolland Co., Connecticut from his birth in 1774 until after the 1790 census.  By 1800 he was in New York state, so Datus was likely born in Jefferson Co. or Otsego Co., New York.

There are tax records for Datus starting in the year 1831 in Green Twp., Ashland Co., Ohio.  On the 1830 census he was listed as age 20-30 with a wife 20-30 and no children and enumerated between Rebecca Castard (Castor) and Bengamin Castard (Benjamin Castor).  Rebecca was the widow of Noah Castor, and Benjamin was the youngest son and heir to two thirds of the farm and a brother of Datus' wife Ruth.

In 1840 Datus and Ruth with their first five children bought a log cabin in Stony Creek Township from the heirs of John Fisher on land which is now Lapel.  They built a new house of oak, poplar and walnut in 1856, where they reared their eleven children.   The Studley farm was originally 160 acres, but the railroad right of way took some, the highway took some more, and parts were sold until the remaining land was 56 acres.  When Datus died in 1874, the heirs sold the homestead.  The Studley house, which by 1886 sat on a 100' x 132' lot,  was moved back from the road to make way for a store, which became a bank in 1918.  Datus preached in the M.E. Church.

1840 Stony Creek Twp., Madison Co., IN census
Datus Studley 30-40
2 males  5-10 [Sanford & Oliver]
2 females  0-5 [Martha & Mary L.]
2 females  5-10 [Rebecca & ?]
1 female   30-40 [Ruth Castor]

1850 Census Stony Creek Twp., Madison County, IN; 136/136
Datis E. Studly      41 CT          farmer
Ruth C.         44 PA
Rebecca C.    19 OH
Sanford         18 OH          farmer
Calvin W.      15 OH
Mary L.         13 OH
Martha Jane   11 OH
Datis E.          8 OH
Charles C.      4 OH
Maryarette E.  2 OH
Cyrus             1 IN

1860 Census Stony Creek Twp., Madison County, IN; 1424/1424
D. E. Studley        52 KY          farmer
Ruth             54 PA
Calvin           26 OH          farm hand
Mary            23 OH
Datis E.        19 IN          farm hand
Charles         17 IN
Cyrus            12 IN
Margaret        12 IN
Joseph             9 IN

1870 census Indiana, Madison County, Stoney Creek Twp, p 21, #162
D E Studley    62 CT
Ruth        64 PA
Joseph W.  19 IN

One of my sources of information on the Studley, Castor and Elsten families is the book History of Lapel and Fishersburg by Edith V. Cascadden 1938, a gift from Clarence "Cricket" Elsten.
Some information came from Jean White, whose husband Charles is descended from Datus and Ruth.
I used other histories of Ashland County, Ohio and Madison County, Indiana.