Questions tagged [bedrock]

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4
votes
2answers
173 views

Does the existence of limestone nodules in a clay soil horizon indicate a limestone bedrock?

A profile (clay soil) was excavated to a depth of 100 cm in the north of Tunisia. We have found limestone nodules, colluvium and alluvium. What I would like to know is the nature of the bedrock of ...
3
votes
2answers
97 views

Why is the bedrock buried so deeply in much of northern Minnesota?

Although parts of northern Minnesota have bedrock exposed at the surface (especially in the Boundary Waters area and along the short of Lake Superior), the more usual situation here is for the bedrock ...
1
vote
0answers
44 views

Artifact? Found in US North Carolina close to Morrow Mountain State park [closed]

Scale in inches. I found this in a river. One surface of it (narrow surface) is so flat that I couldn’t quit looking at this find.
5
votes
1answer
94 views

What caused those colorations in bedrock?

I took those photos in a hurry (sorry, the color is a bit off due to low light, the first picture is the most distorted one). It struck me that the discolorations seem to follow the fissures in the ...
1
vote
0answers
34 views

Can anyone identify my rocks? Found in Arizona, I would be hugely grateful

Hey, I collect rocks from every holiday, but unfortunately I'm a complete novice and have no knowledge of rock at all, I found this with another strange few rocks from the grand canyon and the ...
1
vote
0answers
50 views

What lies beneath the Maldives?

What kind of underlying material are atolls like the Maldives built upon? Is there bedrock down there, or is it just sand and coral?
1
vote
1answer
310 views

Oldest to Newest Bedrock in the USA “road trip”

I am supposed to design a road trip (using major highways) across North America. I have to design a route that starts with the oldest rock of Archean age and finishes with the youngest rock of ...
2
votes
1answer
148 views

Does the Composition of Rock Near the Epicenter Affect the Effects of an Earthquake?

Aside from the earthquake triggering a quick clay landslide, is there anything else notable?
3
votes
2answers
101 views

is there any technique developed that can estimate depth of bedrock?

I am looking for some technique or machine developed to estimate how deep is a hard rock starting around 100 meter below earth surface. If somebody wants to estimate how deep is that hard rock, how ...
1
vote
2answers
227 views

Geology: What's make a group of bedrock a formation?

Geology: What's make a group of bed a formation?
9
votes
2answers
2k views

Horizon letter for bedrock

What is the official letter for the bedrock soil horizon? I know that the letters to represent the A, B, and C horizons are widespread, but the fourth layer (bedrock) is referred to with different ...
14
votes
1answer
218 views

How are the patterns in solid rock born

I took this photo on my vacation in Finland showing white stripes in the rock going different ways. How are these patterns born?