SMT PLT DESCENDED THROUGH ARSA WITHOUT CONTACT WITH CONTROLLING FAC.

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ON 8/FRI/88 WHILE FERRYING AN ACFT VFR TO READING; PA; AT A CRUISING ALT OF 12500'; 70 MI OUT; I RECEIVED READING'S ATIS Z; CEILING 3000' BROKEN; VIS 10 MI. I BEGAN MY DSCNT TO 4500' BECAUSE I WAS WBOUND. AFTER TALKING TO WILLIAMSPORT FSS AS I AIR FILED OUTBND AND RETURN; I KEPT DSNDING TO STAY CLR OF CLOUDS. WHILE DOING SO; I INADVERTENTLY ENTERED ALLENTOWN'S ARSA; KEEPING CLR OF TFC AT ALL TIMES. AT 23 MI NE I CONTACTED READING APCH CTL FOR LNDG AND AFTER LNDG WAS TOLD TO CONTACT ALLENTOWN APCH BY PHONE. THE PROB IS THAT THE ARSA IS VERY POORLY MARKED ON THE IFR CHARTS. DEVOTING PRIMARY TIME TO ACFT AND VISUAL SEP; IT WAS EASY TO FLY PAST THE SMALL DOTS ON THE IFR CHART. AT NO TIME WAS SAFETY OF FLT AFFECTED; BUT THE ARSA SHOULD BE MORE CLEARLY MARKED TO AVOID THIS TYPE OF INCIDENT. ALL THE TCA'S AND MRA'S ARE SHADED ON THE IFR CHARTS; MAKING IT CLEAR ON THE IFR CHARTS WHEN THE ROUTE OF FLT PENETRATES ONE OF THESE AREAS. SINCE THE ARSA REQUIRES MANDATORY CONTACT IT WOULD BE ADVISABLE TO HAVE SOME CLEAR DEMARCATION OF THESE AREAS ON IFR CHARTS.