FLT CREW WORK SCHEDULING PROB WHEN CREW IS REASSIGNED A NEW FLT THAT EXCEEDED THEIR 8 IN 24 RULE. NOTED AFTER LNDG AT OAK; CA.

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AFTER COMPLETING THE LEG FROM PHL TO DFW; FLT ABCD ON FEB/MON/03; AND AFTER ARRIVING AT THE GATE; THE FLT ATTENDANT INFORMED ME THAT THERE WAS A CALL FOR ME ON THE JETBRIDGE PHONE. I WAS TOLD BY THE PERSON ON THE PHONE THAT OUR NEXT LEG FROM DFW TO ORF WAS CANCELLED; AND THE FO AND I WERE SCHEDULED TO WORK FLT EFGH FROM DFW TO OAK. I CHKED MY SCHEDULE AND NOTICED THAT OUR 3-DAY TRIP WAS NOW A 2-DAY TRIP AND IT WAS NOT SHOWING AS A REASSIGNMENT OR RESCHEDULE. I CALLED CREW TRACKING TO FIND OUT WHY THE DFW TO OAK LEG WAS NOT A REASSIGNMENT OR A RESCHEDULE; AND THE TRACKER INFORMED ME THAT SINCE HE COULD NOT LEGALLY GET US TO ORF TO FINISH THE REST OF OUR SEQUENCE; THAT HIS ONLY OBLIGATION WAS TO GET US BACK TO BASE ON THE NEXT AVAILABLE FLT. HE THEN INFORMED ME THAT THE FO AND I WOULD BE WORKING FLT EFGH FROM DFW TO OAK. AFTER LOOKING AT THE SEQUENCE TODAY; I BELIEVE THAT THE DFW TO OAK LEG WAS A RESCHEDULE. SINCE THE PHL TO DFW LEG FLYING TIME WAS 4 HRS 34 MINS AND SINCE ADDING THE NEWLY SCHEDULED DFW TO OAK LEG TOTALED 8 HRS 22MINS BEFORE LEAVING DFW; I BELIEVE THAT WE WERE ILLEGALLY SCHEDULED TO FLY MORE THAN 8 HRS IN 1 DAY WHEN WE WERE REQUIRED TO WORK THE ADDED LEG OUT OF DFW.