SQL Server 2008 :: Finding Beginning Date From Multiple Lines Of Date Ranges?

I am trying to find a beginning date from multiple date ranges, for example:

RowNumberidBegin dtEnd Dt
107933192014-09-022015-06-30
207933192013-09-032014-09-01
307933192012-09-042013-09-02
407933192011-09-062012-09-03

For this id: 0793319, my beginning date is 2011-09-06

108203492014-09-022015-06-30
208203492013-09-032014-09-01
308203492012-09-042013-09-02
408203492011-12-122012-07-03--not a continuous date range

For this id: 0793319, my beginning date is 2012-09-04

108203492014-09-022015-06-30

For this id: 0820349, my beginning date is 2014-09-02

To find continuous date, you look at the beginning date in row 1 and end date in row 2, then if no break in dates, row 2 beginning date to row 3 end date, if no break continue until last date There could multiple dates up to 12 which I have to check for "no break" in dates, if break, display beginning date of last continuous date.