<p>These are fossil burrows... Looks like Thalassinoides or something similar. They are made by fishes, sea anemones, and crustaceans and can occur in different shapes... elongated, rounded, ending in t-sections, straight, spiral-shaped. A scalebar would be helpful for further classification.</p>

<p><a href="https://i.sstatic.net/s13GS.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/s13GS.jpg" alt="One version of classical Thalassinoides"></a></p>

<p><a href="https://en.m.wikipedia.org/wiki/Thalassinoides" rel="nofollow noreferrer">Take a look at the Wikipedia page about it</a> </p>

CC BY-SA 4.0
2018-11-03T17:10:10.497Z
2018-11-04T15:30:53.237Z
2018-11-04T15:30:53.237Z
JulPal
<p><img src="https://i.sstatic.net/M9A5U.jpg" alt="enter image description here"> i found this amongst some river rock. Please explain why or what happened to it.</p>

CC BY-SA 4.0
2018-11-03T12:15:29.757Z
Please read [this guide](https://earthscience.stackexchange.com/questions/9776/mineral-rock-identification) and edit in as much information as you can, especially where you found it geographically. Without more information, there's no way to distinguish what we're seeing from construction adhesive.
Spencer
<geology>
Please explain how this rock could be shaped like this
Richard Gorden
# Please explain how this rock could be shaped like this

(Asked by: username_0 on 2018-11-03)

![enter image description here](https://i.sstatic.net/M9A5U.jpg) i found this amongst some river rock. Please explain why or what happened to it.

**Tags:** geology

> **Comments:**
> **username_1**: Please read [this guide](https://earthscience.stackexchange.com/questions/9776/mineral-rock-identification) and edit in as much information as you can, especially where you found it geographically. Without more information, there's no way to distinguish what we're seeing from construction adhesive.  

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## 1 answers

### Answer by username_2 on 2018-11-03. Score: 3

These are fossil burrows... Looks like Thalassinoides or something similar. They are made by fishes, sea anemones, and crustaceans and can occur in different shapes... elongated, rounded, ending in t-sections, straight, spiral-shaped. A scalebar would be helpful for further classification.

[![One version of classical Thalassinoides](https://i.sstatic.net/s13GS.jpg)](https://i.sstatic.net/s13GS.jpg)

[Take a look at the Wikipedia page about it](https://en.m.wikipedia.org/wiki/Thalassinoides)


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