Oncolites

Much larger than ooids, but hard to make out here as there's very
little color difference to the rock.

Ooids

Jurassic rocks with ooids present, helping us understand this is a
marine deposit, rather than lacusturine limestone as originally
thought. Have to get close to see them...

Sequence 7

The next sequence in the basin begins in this area. Let's look for it...

Sequence 8 Boundary

To finish the day, we are on a short hike up a canyon to explore the
thrust that bounds the Cameros Basin. In this area sequence 8, which
is Aptian in age, is the footwall, while the hanging-wall is Jurassic.

Gypsum-Anhydrite-Gypsum

Interbedded gypsum and carbonate where the gypsum altered to Anhydrite
and back to gypsum. There is also some sulphur present.

Emma's Field Area

We're now getting into the part of the Cameros Basin where Emma works.

Teepee Structures

Sequence 3

Lunch...

Mud cracks

In this carbonate are a number of great mud crack exposures. These mud
cracks were originally gypsum filled.

Sequence Two

Examining the carbonate at the top of Sequence 2. Good examples of
stromatolites.

Overview

At this stop

Thrust

We are starting the day with a picturesque overview, where we observe
one of the thrusts placing Triassic over Tertiary in the northern
Cameros Basin.

Defense

We're spending time in areas known for ticks, so we're taking
defensive measures.

Arnedillo

We ended our first day in the Cameros Basin in Arnedillo. One of the
great features of this small town, nestled in a rugged valley are the
hot springs. A welcome treat after a long day of hiking and driving.
Fortunately we are spending tonight here as well, so we'll get another
chance to soak and relax, and perhaps discuss some high-temperature
geochemistry.