San Marcos Greenbelt Alliance •  107 E. Hopkins St. Suite 121A; San Marcos, Texas 78666

The Loop


Geology Hike at Spring Lake Preserve

SMGA sponsored its first hike of 2010 on Saturday, February 27 at Spring Lake Preserve. Andy Grubbs, a local geologist who is quite familiar with our area, led 9 of us on a geology based tour of the area. Spring Lake has many layers of the Balcones faultline from Eagle-Ford down to Edwards Limestone. We noted the buds on the Mexican buckeye and the agarita and noted many blooms already popping out. It was a gorgeous early spring day with lots of bird serenade and, with Andy’s help, very enlightening. Thanks Dick McBride for the photos.

Andy talking about the Eagle-Ford formation and the Georgetown layer.


Who or what made this mighty big hole?

Sink Creek amazement – standing water!

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