Changes

|spouse=Marjorie Terry Clarke (divorced)<br>

|spouse=Marjorie Terry Clarke (divorced)<br>

(2) Ellen Meng Lanham Clarke <br>

(2) Ellen Meng Lanham Clarke <br>

Children=From second marriage:<br>

Children from second marriage:<br>

Carole Steele Clarke<br>

Carole Steele Clarke<br>

Two stepdaughters

Two stepdaughters

In 1920, Clarke at twenty-three obtained a [[patent]] for a metal casing used in the oil industry.<ref>{{cite web|url=http://www.google.com/patents/US1462131|title=Patents: Clem S. Clarke|publisher=google.com|accessdate=February 11, 2015}}</ref>​

In 1920, Clarke at twenty-three obtained a [[patent]] for a metal casing used in the oil industry.<ref>{{cite web|url=http://www.google.com/patents/US1462131|title=Patents: Clem S. Clarke|publisher=google.com|accessdate=February 11, 2015}}</ref>​

==Oil interests==​

==Oil interests==

Cal Clarke's leadership role in the petroleum industry allowed young Clem Clarke access to many figures in the business, particularly Michael Late Benedum, the [[West Virginia]] native who rose to prominence in [[Pittsburgh]], [[Pennsylvania]], but had early holdings in Shreveport and Caddo Parish. Benedum was self-educated in his petroleum career when little was known of geology, and geophysics had not materialized as a field of study.<ref name=interview/>​

Cal Clarke's leadership role in the petroleum industry allowed young Clem Clarke access to many figures in the business, particularly Michael Late Benedum, the [[West Virginia]] native who rose to prominence in [[Pittsburgh]], [[Pennsylvania]], but had early holdings in Shreveport and Caddo Parish. Benedum was self-educated in his petroleum career when little was known of geology, and geophysics had not materialized as a field of study.<ref name=interview/>​