FIGURE 2. Left femur of Isanosaurus attavipachi (CH4-1).
From the following article:
The earliest known sauropod dinosaur
Eric Buffetaut, Varavudh Suteethorn, Gilles Cuny, Haiyan Tong, Jean Le Loeuff, Sasidhorn Khansubha and Sutee Jongautchariyakul
Nature 407, 72-74(7 September 2000)
doi:10.1038/35024060
a, Anterior and b, posterior views. The arrow shows the peculiar S-shaped fourth trochanter. The white area between the fourth trochanter and the proximal articular head corresponds to a section of the specimen where the outer part of the bone is damaged but an inner continuity is present. Scale bar: 10 cm.