Sunday, January 18, 2009

DH-4 Observations

I decided to drive out to the Disappointment Hills on Saturday morning. Very little snow on the south facing slopes in the House and Confusion Ranges, down quite low on the north slopes, the roads are in good shape and were actually dusty. No snow at the eastern outcrops except for a couple of drifts on some of the north slopes, I didnt get up to DH-1. The sun was shining and the temp. was about 45 most of the day, a great day.
Trying to see just which bed my old "Meekoceras" quarry is in. I found several Inyoites in float just below the quarry, they may be the widely umbilicate form common in bed 5 at DH-1. There is a very thin bed about 50cm below the quarry bed (maybe equiv. to bed 4). Below this bed is a gastropod shale, some fairly large, with body chamber molds of some acute ventered ammonoids though more like Inyoites than Aspenites (This is where the Aspenites figured in our recently accepted paper was found). This shale is also where the ?Meekoceras molds and large Arctocerid molds are found on the small knoll just north-west of the quarry. This would mean the thick bed at the base of that knoll is equiv. to bed 3, and the thin bed on the next knoll west would be bed 5. I need to map DH-4 with a little more detail.
If the quarry was equiv to bed 9, the small bed below may be bed 8 and the gastropod shale would be the same as between bed 8 and bed 6 (bed 7 would be a thin bed in the middle of the shale). To find Owenites in the quarry bed or the bed below would possibly solve this question. The lack of small "Xenoceltites" like those at DH-1 at this interval (like the lavender bed) also puts doubt on this theory.
The bedded bivalves found in the quarry level is not really like bed 9, so for now I am leaning toward an equivalence with bed 5

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