Click on photos for enlarged image.
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Stop 10. Group sitting around glacial grooves on Umpire Rock
listening to Charles Merguerian explain the geology of Manhattan and
Central Park
Photo by Gil Hanson. |
| Stop 10.Glacial trough and striations on Umpire Rock
Photo by Andrew Orgonik |
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Stop 10 Close up of galcial striations and trough.
Photo by Andrew Orgonik |
| Stop 10. The Hartland Fm. consists of interbedded mica schist and
granofels, interpreted to be a metamorphosed turbidite sequence. The
granofels is more resistant than the schist and stands out.
Hartland Fm. is cut by numerous veins or dikes of pegmatite, aplite and
quartz. This photo shows a late pegmatite cutting folded bedding in
Hartland Fm. The pegmatite is also folded but less intensely.
Photo by Gil Hanson |
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Stop 10. Two erratics in glacially plucked depression on Umpire Rock.
The boulder in front of Charles Merguerian's left foot is diabase most
likely from the Palisades Sill.
Photo by Gil Hanson |
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Stop 10. Hartland Fm. at Umpire Rock Photo by Gil Hanson |
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Stop 10 F2 isoclinal fold outlined with red line folded
by F3 folds.
Photo by Andrew Orgonik
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| Black Crowned night heron preening on Hartland Fm. near stop 6.
Photo by Andrew Orgonik |
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Stop 11. Just below quarter is a muscovite pseudomorph after kyanite.
Green is lichen.
Photo by Gil Hanson |
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Stop 11 Granofels beds in Hartland Fm Photo by Gil Hanson |
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Stop 11 Erratic of pegmatite on Hartland Fm.
Photo by Gil Hanson |
| Stop 12 Person on right is on Hartland Fm. Person on left is on more
homogeneous Manhattan Schist with folded kyanite nodules.
Photo by Gil Hanson |
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Stop 12 Quarter is on kyanite nodule. The larger white mass is quartz
vein.
Photo by Gil Hanson |
| Stop 13. Kyanite nodules in Manhattan Schist with quarter for
scale.
Photo by Gil Hanson |
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In the vicinity of Stops 3 and 4. U-shaped, folded quartz vein.
Photo by Gil Hanson |
| Stop 5 Block of well bedded Hartland Fm in more homogeneous kyanite-nodule
rich Manhattan Schist. The existence is consistent with the hypothesis
that the Manhattan Schist may be a result of shearing.
Photo by Gil Hanson |
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Stop 5 Close up of block of Hartland Fm and Manhattan Schist contact.
Photo by Charles Merguerian |
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Group photo at Stop 5 Photo courtesy Charles Merguerian |
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