Hello Debra,
I live in Harrisburg, which is about 18 miles from
Marked Tree and have never heard of Spencer Co.. I
have some webpages I can give you that might help
you in your search:
http://couchgenweb.com/poinsett/mtmus.htm
http://users.bscn.com/harryv
http://freepages.geneology.rootsweb.com/~lunsford/cemeteries...

The first webpage is the Marked Tree historical society
webpage and you might email the president and ask her about
the company.
The second webpage is a very extensive geneology webpage about Poinsett County and has listings of all cemeteries in
Poinsett and areas around Poinsett.
The third is another listing of cemeteries in Poinsett County.

I have one other contact you might email but would need you
to email me for the address.
Hope this helps you in some small way in your search.

Johnny