Photos from Geology of Central Park Field Trip

Led by Charles Merguerian
on Sat. June 26, 2004

Link to Field Guide

Click on photos for enlarged image.

group-umpire.JPG (40832 bytes) 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

glacialtrough&striationsUmpireRock.jpg (177454 bytes)
closeupofglacialstriations&troughUmpireRock.jpg (177488 bytes) 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

pegmatite-umpire.JPG (63204 bytes)
diabase-erratic.JPG (75164 bytes) 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

Stop 10. Hartland Fm. at Umpire Rock

Photo by Gil Hanson

hartland-umpire.JPG (63608 bytes)
F2F3foldinHartland.jpg (166337 bytes) Stop 10 F2 isoclinal fold outlined with red line folded by F3 folds.

Photo by Andrew Orgonik

 

Black Crowned night heron preening on Hartland Fm. near stop 6. 

Photo by Andrew Orgonik 

blackcrownednightheron--preening.jpg (145804 bytes)
musc-pseudomorph.JPG (62612 bytes) Stop 11. Just below quarter is a muscovite pseudomorph after kyanite. Green is lichen.

Photo by Gil Hanson

Stop 11 Granofels beds in Hartland Fm

Photo by Gil Hanson

granofels-beds.JPG (62732 bytes)
erratic-drills.JPG (67480 bytes) 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

manhattan-hartland.JPG (57572 bytes)
kyanite-quartz.JPG (96544 bytes) 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

kyanite-nodule.JPG (79516 bytes)
folded-quartz.JPG (84448 bytes) 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

block-hartland in Manhattan.JPG (75576 bytes)
CM-2.jpg (79026 bytes) Stop 5 Close up of block of Hartland Fm and Manhattan Schist contact.

Photo by Charles Merguerian

Group photo at Stop 5

Photo courtesy  Charles Merguerian

CM-1.jpg (50508 bytes)