Seems pretty straightforward:
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(a) Plants. No person shall possess, destroy, injure, deface, remove, dig, or disturb from its natural state any plant or the parts or products thereof in any park, beach or recreational facility, except as otherwise provided herein. No person shall attach or affix any handbill, notice, sign or advertisement on any plant or part thereof in or adjacent to a park or recreational facility.
Don't dig up any flowers to take home.
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(c) Artifacts. No person shall possess, destroy, injure, deface, remove, dig, or disturb from its natural state any fossilized or nonfossilized paleontological specimens, cultural or archaeological resources, or the parts thereof in any park, beach or recreational facility.
Leave the arrowheads and stuff for the archaeologists.
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(d) Minerals. No person shall possess, destroy, injure, deface, remove, dig, or disturb from its natural state any rock, mineral, geological formation or cave formation or the parts thereof in any park, beach or recreational facility.
It took a thousand years to grow a six inch stalactite. If every visitor took one home, the cave formations would be another hole in the ground within six months.
IOW, don't destroy anything and replace your divots.