Overlapping airspace

Skim94

New member
Hello,
I'm having some confusion with overlapping airspaces. If I am flying from the south to kcfo (colorado air and space) where the airspace is from surface up to but not including 8,000 feet, this overlaps the class bravo airspace of KDEN (Denver international) as the bravo shelf starts at 7000 up to 12,000 feet. If i were to fly from the south at say 7200ft expecting to go into the delta airspace even though the bravo is overlying the delta, will I have to get bravo clearance from KDEN even though the class delta of KCFO airspace extends to 7999ft? Or if I am talking to KCFO tower will I be able to fly through that section where there is overlap?
Image link below of sectional chart.
https://pasteboard.co/JkR48Fy.jpg
 
I have never noticed this before or flown into such a situation. I wonder what the rationale is, rather than just having them be disjoint?
 
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