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enter image description here i found this amongst some river rock. Please explain why or what happened to it.

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closed as unclear what you're asking by Spencer, Fred, Jan Doggen, daniel.neumann, Gimelist Nov 5 '18 at 9:07

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Please read this guide 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. $\endgroup$ – Spencer Nov 3 '18 at 12:15
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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

Take a look at the Wikipedia page about it

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