Rocks

Rocks at Greenbrook

2025-12-012025-11-29Sherry Felix4 Comments

The igneous rocks at Greenbrook are part of the Palisades Sill – Wikipedia. The rocks are mostly diabase. Research on the origins of the intrusion(s) is ongoing.

Boulders and rocks covered in moss, surrounded by fallen leaves and trees in a forest at Greenbrook. — Greenbrook 11/15/2025

Rock formations at Greenbrook showcasing diabase from the Palisades, surrounded by autumn foliage and moss-covered ground. — Greenbrook 11/15/2025

Rockefeller SP

2024-09-202024-09-19Sherry Felix9 Comments

We did a short hike to the Glacial Erratic at Rockefeller State Park Preserve (ny.gov) in Pleasantville, New York in Westchester County in the afternoon of Sunday September 15^th. The granite rock is tilted 90 degrees from how it was originally metamorphosed deep beneath the Earth’s surface. There are white veins of lower meting po9int quartz that separated out during metamorphosis. 600 million years old. This mass of free-standing gneiss, almost 20 feet high and 65 feet in circumference, is probably the largest ”glacial erratic” to be found anywhere in the county. The glacier that transported the glacial erratic to Rockefeller State Park Preserve was part of the Late Wisconsin glaciation, which occurred approximately 20,000 to 25,000 years ago.

The activates look interesting. Maybe I’ll get a chance to try one or two.

Swan Lake is a lovely lake to walk around.

Glacial Erratic, Rockefeller SP 9/15/2024

Roots

2024-07-312024-07-28Sherry Felix8 Comments

A new edit of an old photograph. Rocks don’t stand a chance against trees.

Boudinage

2021-12-192021-12-18Sherry Felix4 Comments

Revisiting an old image for reprocessing. Pelham Bay has lots of Fordham gneiss. Here is a dense article on the Bedrock Geology of New York City: More than 600 m.y. of geologic history (sunysb.edu). I love geology. It was my manor at Hunter College.

Geology lesson: Boudinage is a structure which is sometimes present in metamorphic rocks apparently as a result of tension and in which a competent bed is thinned and thickened so that it resembles in cross section a string of sausages (Webster’s).

Hunter Island granite with boudinage, Pelham Bay, NY 10/29/2001

Local Nature

2020-03-22Sherry Felix15 Comments

Over the last several days we went out for short walks to stretch our legs while maintaining “social distance”. Here is a selection of plants. The multi-color schist used in the wall along the Hudson River Park has pink feldspar and green feldspar coloring the layers. I used my Samsung Note 10+ to photograph these.

Sydney Trees and Rocks

2015-10-042016-05-05Sherry Felix6 Comments

13^th posting of photographs of Sydney August, 2015

Rocks thrill me and I love trees. I studied geology and worked as an environmental educator so when I travel I always pay attention to the inorganic as well as organic features in the environment. Here are some of the sandstone formations, eucalyptus trees, and fig trees of Sydney, Australia.