Sipalay, Negros Occidental Region, Negros Island, Philippines
This latest collection of tektites came from Helen, the same person who supplied Des Leong with tektites from the Davao Region. These specimens came via her mother who lives in Isabela, Negros Occidental (note that there are many Isabela's in the Philippines!). In total I bought around 8.5 kilos of variable quality tektites on 8th July 2008. The find locality was slightly vague, but coming from the mining in the Sipalay area. Beyer recorded Negros Occidental region as a tektite locality, but marked his map towards the north, rather than the south, of Negros Island. These tektites were pretty similar to those from the Davao Region so we asked her extensively about the localities of all the tektites. She confirmed that this is the first batch from her mother in Negros Occidental and that all the others came from Davao. In fact she only added that they were from a different region as a passing comment when we had unwrapped the tektites: we had just assumed that they were all Davao tektites as before.
The tektites being recovered from some of these new localities are really re-writing the book on the classic Philippinite, which everyone assumes to be deeply U-grooved. These specimens are much fresher and show the appearance of the tektite prior to extensive chemical etching and transportation. Many of these tektites resemble Javanites and Australite cores closer than our classic image of the Philippinite.
ABOVE: Selected 'fresher' tektites from this locality.
ABOVE: Three cores (48.6g, 37.3g and 53.8g). The upper row shows the posterior (primary) surface with a very poor sculpture, not quite making the Anda sculpture grade. The bottom row shows one side view and three anterior views. Note the presence of navels, but lack of U-grooves.
ABOVE: An 83.0g core with a small piece of attached shell. Posterior at top, anterior at base.
ABOVE: Three cores 54.6g, 66.1g and 98.0g. Note the navels and the cracks that would later develop into U-grooves if etched.
ABOVE: The same 66.1g core as in the middle of the picture above. Close up of the cracks.
ABOVE: This is the only true Anda-type tektite out of the whole batch, although other specimens showed a tendancy rowards Anda-type sculpture. You can see the 'birds feet' texture on the posterior. The smaller image shows the grooved anterior surface.
ABOVE: Many specimes show this 'drop-mark' (Koenigswald) texture. It is currently uncertain how this texture develops.
ABOVE: A good percentage of specimens (maybe 5%) showed evidence of shells or navel protrusions.
ABOVE: A 30.6g core retaining part of it's shell. The shell has been lost from both the anterior and posterior. In the photo the posterior is at the top and anterior at the bottom. Although not visible, the same specimen has excellent 'drop-marks'.
ABOVE: A 48.2g specimen showing retained shell and some 'drop-marks'.
ABOVE: An 18.6g core showing retained shell. The first photo shows the anterior surface and the second photo shows a side view with the anterior at the base and posterior (primary) surface at the top.
ABOVE: Two dumbbells weighing in at 69.5g (top) and 115.4g (bottom). Dumbbells, ovals, rounded specimens and teardrops were found. Notably teardrops were not that common.
I hope you enjoyed these great tektites - they really help in understanding the grooving in the bikol tektites.