Question: What do the collection of andesite stones found in Ica Province, Peru offer proof of?

Context paragraphs:
Ica stones: The Ica stones are a collection of andesite stones found in Ica Province, Peru that bear a variety of diagrams.  Some of them supposedly have depictions of dinosaurs, and what is alleged to be advanced technology.  These are recognised as modern curiosities or hoaxes.

San Andrés District: San Andrés is a district in middle Pisco Province in Peru.  It is bordered by the Pacific Ocean on the west, districts of Pisco and Tupac Amaru Inca on the north, Ica Province on the east, and the Paracas District on the south.

El Carmen (San Juan Bautista): El Carmen (latitude -13.970634, longitude -75.729141) is an agricultural village in the district of San Juan Bautista which is in the Province of Ica, in the Region of Ica, in south Peru.  (Not to be confused with a 'district' of the same name of El Carmen which is located to the north in the Chincha Province of Ica Region).

Pueblo Nuevo District, Ica: Pueblo Nuevo District is one of the fourteen districts of the Ica Province in Peru.

San Juan Bautista District, Ica: San Juan Bautista District is one of fourteen districts of the Ica Province of the Ica Region of Peru.  The District 'seat' is the town of San Juan Bautista.

Sillar: Sillar is a variety of rhyolite, which is a type of volcanic rock.  Although sillar is of rhyolitic composition, it has been erupted from volcanoes which mostly erupt andesite lava, and sillar contains small fragments of andesite.  A pink variety of sillar owes its colour to crystals of hematite within the rock.  A white variety lacks these hematite crystals.  Sillar is found as pyroclastic flow deposits of tuff near volcanoes in southern Peru, for example the now-extinct Chachani volcano which erupted flows of sillar during the Pleistocene epoch.

Ica Province: The Ica Province is the largest of five provinces of the Ica Region in Peru.  The capital of the province is the city of Ica.

Ica District: Ica District is one of fourteen districts of the province of Ica in region of Ica within Peru.

Northwest Science Museum: Northwest Science Museum is a creationist museum in Idaho.  It opened on June 14, 2014.  The museum's directors plan to create a 350,000 square foot facility including a full-scale model of Noah's Ark near Boise, Idaho, replacing the museum's current "Vision Center" near the state capitol in Boise.  The museum's founders say that their collection of Ica stones offer proof that humans and dinosaurs coexisted, that out-of-place artifacts constitute "damaging evidences ["sic"] against evolution", and they can show with other evidence the Earth is 6,000 years old and it was physically possible for Noah to bring dinosaurs on board the Ark.

Comatrana: Comatrana is a town in Ica Province, Peru, located 3 kilometres from Ica.  Landmarks of note include the San José de Madres Carmelitas Descalzas Monastery and the Comatrana Temple.

Supporting paragraphs: Northwest Science Museum Ica stones
Answer: humans and dinosaurs coexisted