AL90

Fig. 1. Excavation at AL90 Site during the Riversleigh 1995 field season (Photo K. Black).

Fig. 2. Excavation of a large fossil-bearing limestone block at AL90 Site, June 2000 (Photo courtesy of A. Gillespie).

Fig. 3. Unprocessed block of limestone from AL90 Site showing exceptionally preserved Nimbadon skull (Photo courtesy of A. Gillespie).

Fig. 4. Unprocessed block of limestone from AL90 Site showing articulated postcranial material (Photo K. Black).

Fig. 5. Sectioned limestone block revealing two complete halves of a Nimbadon skull. (See Figure 11 for this skull following acid-processing)(Photo courtesy of A. Gillespie).

Fig. 6. Articulated postcranial material including pelvis, vertebrae and leg elements of Nimbadon (Photo courtesy of A. Gillespie).

Fig. 7. Partially acid-etched limestone showing Nimbadon skull and skeletal elements (Photo K. Black).

Fig. 8. Exceptionally preserved articulated skeleton of a bulungamayine kangaroo from AL90 embedded in resin (Photo K. Black).

Fig. 9. Partially acid-etched skull and skeleton of a bulungamayine kangaroo from AL90 site (Photo K. Black).

Fig. 10. Composite skeleton of the sheep-sized diprotodontid Nimbadon lavarackorum from the middle Miocene cave deposit, AL90 (Photo K. Black).

Fig. 11. Fully prepared Nimbadon skull from limestone blocks shown in Figure 5 (Photo K. Black).

Fig. 12. Some of the already prepared adult crania of Nimbadon from AL90 Site (Photo K. Black).

Fig. 13. Nimbadon lavarackorum cranial ontogenetic series and hypothetical developmental stages (From Black et al., submitted).