Miroslav Verner notes that in the work crew's mason marks and inscriptions, "either Djedefra's throne name or his Golden Horus name occur exclusively." Verner writes that the current academic opinion regarding the attribution of this date to Djedefre is disputed among Egyptologists: Rainer Stadelmann, , favour dating it to Djedefre whereas Wolfgang Helck, , Jean Vercoutter and W.S. Smith attribute this date to Khufu instead on the assumption "that the ceiling block with the date had been brought to the building site of the boat pit already in Khufu's time and placed in position [only] as late as during the burial of the funerary boat in Djedefre's time." The German scholar Dieter Arnold, in a 1981 MDAIK paper noted that the marks and inscriptions of the blocks from Khufu's boat pit seem to form a coherent collection relating to the different stages of the same building project realised by Djedefre's crews. Verner stresses that such marks and inscriptions usually pertained to the breaking of the blocks in the quarry, their transportation, their storage and manipulation in the building site itself: "In this context, the attribution of just a single inscription—and what is more, the only one with a date—on all the blocks from the boat pit to somebody other than Djedefra does not seem very plausible." Verner also notes that the French-Swiss team excavating Djedefre's pyramid have discovered that this king's pyramid was really finished in his reign. According to Vallogia, Djedefre's pyramid largely made use of a natural rock promontory which represented circa 45% of its core; the side of the pyramid was 200 cubits long and its height was 125 cubits. The original volume of the monument of Djedefre, hence, approximately equalled that of Menkaura's own pyramid. Therefore, the argument that Djedefre enjoyed a short reign because his pyramid was unfinished is somewhat discredited. This means that Djedefre likely ruled Egypt for a minimum of 11 years if the cattle count was annual, or 22 years if it was biennial; Verner, himself, supports the shorter, 11-year figure and notes that "the relatively few monuments and records left by Djedefra do not seem to favour a very long reign" for this king. Pyramid complex Djedefre continued the move north in the location of pyramids by building his (now ruined) pyramid at Abu Rawash, some to the north of Giza. It is the northernmost part of the Memphite necropolis. While