The settlement at Izapa extended over 1.4 miles, making it the largest site in Chiapas. The site reached its apogee between 600 BCE and 100 CE; several archaeologists have theorized that Izapa may have been settled as early as 1500 BCE, making it as old as the Olmec sites of San Lorenzo Tenochtitlán and La Venta. Izapa remained occupied through the Late Classic period. The period of Izapa’s height is still unknown due to little material for carbon dating, so the issue is still widely debated.
Due to the abundance of carved stelae and monuments at Izapa, the term "Izapa style" is used to describe similarly executed works throughout the Pacific foothills and highlands beyond, including some found at Takalik Abaj and Kaminaljuyu.
Izapa is located on wet and hilly land made of volcanic soil, though it is still fertile for agriculture. The weather is very hot and very wet. The area around Izapa was a major cacao producing area known as the Soconusco region, which was used by the Aztecs.
Like many Mesoamerican sites, Izapa is laid out just east of true north, It is aligned with the volcano Tacaná and also seems to be situated to the December solstice horizon.
Other archaeologists argue that there not yet enough known to support Coe and that the term "Izapan Style" should only be used when describing art from Izapa. Virginia Smith argues that Izapan art is too unique and different in style to be the result of Olmec influence or the precursor to Maya art. Smith says that Izapan art is very site specific and did not spread far from the site. Izapan art most likely did indirectly influence Maya art, though it would just be one of the many influences on the Maya.
Izapa is also included in the debate of the origin of the 260-day calendar. The calendar was originally thought to be a Maya invention, but recently it has been hypothesized that calendar originated in Izapa. This hypothesis is supported by the fact that Izapa fits the geological and historical conditions better than the previous place thought to be the origin.
The sheer number of sculptures outweighs that of any contemporaneous site. Garth Norman has counted 89 stelae, 61 altars, 3 thrones, and 68 "miscellaneous monuments at Izapa. In contrast to the ruler-oriented sculpture of the Epi-Olmec culture 330 miles (550 km) across the Isthmus of Tehuantepec, Izapan sculpture has features mythological and religious subjects, and is ceremonial and frequently narrative in nature.
Also, in contrast to Epi-Olmec and later Maya stela, Izapa monuments rarely contain glyphs. Although this could imply that the Izapan culture lacked knowledge of any writing system, Julia Guernsey, author of a definitive work on Izapa sculpture, proposes instead that the monuments were intentionally language-free and that "Izapa's position at the juncture of two linguistic regions [i.e. Mixe-Zoque and Maya] may have fostered the penchant for non-verbal communicative strategies.
Izapa Stela 2, like Stela 25, has been linked to the battle of the Maya Hero Twins against Vucub Caquix, a powerful ruling bird-demon of the Maya underworld, also known as Seven Macaw.
Izapa Stela 3 shows a deity wielding a club. This deity’s leg turns into a serpent while twisting around his body. This could be an early form of the Maya God K, who carried a staff.
Izapa Stela 4 depicts a bird dance, which has a king being transformed into a bird. The scene is most likely connected with the Principle Bird Deity. This transformation could symbolize shamanism and ecstasy, meaning the shaman-ruler used hallucinogens to journey to another world. The type of political system that was in place at Izapa is still unknown, though Stela 4 could suggest that a shaman was in charge. This shaman-ruler would serve the role of both the political and religious leader.
Izapa Stela 5 presents perhaps the most complex relief at Izapa. Central to the image is a large tree, which is surrounded by perhaps a dozen human figures and scores of other images. The complexity of the imagery has led some fringe researchers, particularly Mormon and "out of Africa" theorists, to view Stela 5 as support for their theories.
Izapa Stela 8 shows a ruler seated on a throne. The scene shown on Stela 8 is often compared to Throne 1, which was located by the central pillar of Izapa. Stela 8 may be showing a ruler seated atop Throne 1.
Izapa Stela 21 is a rare depiction of violence involving deities. The Stela illustrates a warrior holding the head of a decapitated god.
Izapa Stela 25 possibly contains a scene from the Popol Vuh. The image depicted on Stela 25 is most likely the Maya Hero Twins shooting a perched Principle Bird Deity with a blowgun. This scene is also shown on the Maya pot called the "Blowgunner Pot". It is also suggested that Stela 25 could be seen as a map of the night sky, which was used to tell the story of the Hero Twins shooting the bird deity.