Hi Sue! The Lamar County USGenWeb has a wonderful marriage database. They also have a FABULOUS cemetery database.
I checked an there are several Carltons listed. Unfortunately, as was the case in older records, they are all by intitals: Carlton, Cannie Loe1906H. C. KillingsworthLamarTX Carlton, D. T.1895Katie JohnsonLamarTX Carlton, M. C.1884J. W. BaliverLamarTX Carlton, M. R.1883S. S. MusickLamarTX Carlton, R. H.1905Victoria Hardy LamarTX Carlton, W. R.1901Katie CarningLamarTX
Unless Rhoda was a man, that doesn't look like her. But definitely looks like Miranda.
Here's the website if you would like to play around with it.