Could you, please help with this snake/crocodile pattern on the rock I found?

[shaman]

Hi everyone! I hope yo can help me with ID or any info regarding the rock in the photos?

Country: Portugal
Province: Algarve (West Part)
City: near Alvor 
Location details: Found at small hill
Dimensions; 90mm x 60mm x 40mm
Scale used in photos : mm/cm

I will be happy to provide more details if needed.

Thanks in advance.

[Darktooth]

It appears to be a conglomerate, which is a rock made up with a bunch of smaller rocks stuck together through mineralization/ hardening of sediment.

[Rockwood]

This looks natural, but a similar look is seen in decorative concrete pavers. There isn't really much difference in composition anyway. 

[shaman]

Thanks a lot for your quick reply! I really appreciate your time to explain the formation of this rock. Great community.